diff --git a/cmake/PanoPainterSources.cmake b/cmake/PanoPainterSources.cmake
index 396bc4bb..61c8304e 100644
--- a/cmake/PanoPainterSources.cmake
+++ b/cmake/PanoPainterSources.cmake
@@ -34,6 +34,7 @@ set(PP_LEGACY_PAINT_DOCUMENT_SOURCES
     src/legacy_canvas_object_draw_services.h
     src/legacy_canvas_projection_services.cpp
     src/legacy_canvas_projection_services.h
+    src/legacy_canvas_plane_data.cpp
     src/legacy_canvas_state_services.cpp
     src/event.cpp
 )
@@ -171,6 +172,8 @@ set(PP_PANOPAINTER_UI_SOURCES
     src/legacy_brush_panel_services.h
     src/legacy_brush_panel_ui.cpp
     src/legacy_brush_panel_ui.h
+    src/legacy_brush_preset_list_services.cpp
+    src/legacy_brush_preset_list_services.h
     src/legacy_document_animation_services.cpp
     src/legacy_document_animation_services.h
     src/legacy_node_canvas_draw_services.cpp
diff --git a/docs/modernization/roadmap.md b/docs/modernization/roadmap.md
index 2471a37f..9efcaa7a 100644
--- a/docs/modernization/roadmap.md
+++ b/docs/modernization/roadmap.md
@@ -79,12 +79,12 @@ What is still carrying too much live ownership:
 
 Current hotspot files:
 
-- `src/canvas.cpp`: 429 lines
+- `src/canvas.cpp`: 396 lines
 - `src/app_layout.cpp`: 125 lines
 - `src/canvas_modes.cpp`: 402 lines
 - `src/node.cpp`: 260 lines
-- `src/main.cpp`: 141 lines
-- `src/node_panel_brush.cpp`: 337 lines
+- `src/main.cpp`: 130 lines
+- `src/node_panel_brush.cpp`: 255 lines
 - `src/node_stroke_preview.cpp`: 545 lines
 - `src/node_canvas.cpp`: 219 lines
 - `src/app.cpp`: 171 lines
@@ -216,7 +216,9 @@ Current architecture mismatches that must be treated as real blockers:
   `src/platform_windows/windows_bootstrap_helpers.cpp` instead of
   `src/main.cpp`, while the Win32 window procedure and retained message-handling
   shell now also live in `src/platform_windows/windows_window_shell.*`
-  instead of `src/main.cpp`, while retained input-state zeroing and reverse
+  instead of `src/main.cpp`, while the `WinMain` argv conversion bridge now
+  also lives in `src/platform_windows/windows_bootstrap_helpers.*` instead of
+  staying inline in `src/main.cpp`, while retained input-state zeroing and reverse
   key-map initialization now also live in
   `src/platform_windows/windows_window_shell.*` instead of `src/main.cpp`,
   while the remaining interactive Win32 runtime
@@ -267,7 +269,11 @@ Current architecture mismatches that must be treated as real blockers:
   while `Canvas::draw_objects_direct(...)` and `Canvas::draw_objects(...)` now
   route through `src/legacy_canvas_object_draw_services.*` instead of staying
   inline in `src/canvas.cpp`, which trims another coherent object-draw and
-  viewport-state execution family from the live canvas shell, while
+  viewport-state execution family from the live canvas shell, while the
+  static canvas plane geometry/orientation data now also lives in
+  `src/legacy_canvas_plane_data.cpp` instead of staying inline in
+  `src/canvas.cpp`, which trims another retained data-ownership pocket from
+  the live canvas shell, while
   `Canvas::stroke_draw_samples(...)`, `Canvas::stroke_commit()`, and the
   larger stroke commit/sample execution family now also route through
   `src/legacy_canvas_stroke_commit_services.*` instead of staying inline in
@@ -305,7 +311,10 @@ Current architecture mismatches that must be treated as real blockers:
   handling, item construction, and added-state update now also route through
   `src/legacy_brush_preset_panel_ui.*` instead of staying inline in
   `src/node_panel_brush.cpp`, which materially thins another retained preset
-  panel UI pocket, while `NodeCanvas::handle_event()` now also routes
+  panel UI pocket, while the retained `LegacyBrushPresetListServices` block
+  now also lives in `src/legacy_brush_preset_list_services.*` instead of
+  staying inline in `src/node_panel_brush.cpp`, which trims another retained
+  preset workflow pocket, while `NodeCanvas::handle_event()` now also routes
   through `execute_node_canvas_handle_event(...)`, which trims another coherent
   input-routing block from `src/node_canvas.cpp` even though the file is still
   a live canvas/controller shell, while `NodeCanvas` restore/clear context,
diff --git a/docs/modernization/tasks.md b/docs/modernization/tasks.md
index 7488eaab..e9a289d6 100644
--- a/docs/modernization/tasks.md
+++ b/docs/modernization/tasks.md
@@ -148,6 +148,10 @@ Current slice:
   `src/legacy_canvas_render_shell_services.*` instead of staying inline in
   `src/canvas.cpp`, which trims another large retained render/context shell
   from the live canvas owner.
+- The static canvas plane geometry/orientation data now also lives in
+  `src/legacy_canvas_plane_data.cpp` instead of staying inline in
+  `src/canvas.cpp`, which trims another retained data-ownership pocket from
+  the live canvas shell.
 - The `CanvasModePen` and `CanvasModeLine` interaction families now also live
   in `src/legacy_canvas_mode_pen_line.cpp` instead of staying inline in
   `src/canvas_modes.cpp`, which materially thins another retained pen/line
@@ -651,6 +655,9 @@ Current slice:
   in `src/platform_windows/windows_window_shell.*` instead of `src/main.cpp`,
   which materially thins the entry file even though broader runtime/entrypoint
   composition is still open
+- the `WinMain` argv conversion bridge now also lives in
+  `src/platform_windows/windows_bootstrap_helpers.*` instead of staying inline
+  in `src/main.cpp`, which trims another Windows-specific entrypoint pocket
 - retained input-state zeroing and reverse key-map initialization now also live
   in `src/platform_windows/windows_window_shell.*` instead of `src/main.cpp`,
   which trims another small but real retained-state pocket from the entry TU
@@ -1115,6 +1122,10 @@ Current slice:
   `src/node_panel_brush.cpp`, which materially thins another retained preset
   panel UI pocket even though cloud/package worker ownership remains the
   follow-up.
+- The retained `LegacyBrushPresetListServices` block now also lives in
+  `src/legacy_brush_preset_list_services.*` instead of staying inline in
+  `src/node_panel_brush.cpp`, which trims another retained preset workflow
+  pocket while preserving the live list-plan dispatch path.
 - `NodePanelBrush` brush texture panel init, selection dispatch,
   popup-close event handling, restore-failure prompt flow, and added-state
   reset now also live in `src/legacy_brush_panel_ui.*` instead of staying
diff --git a/src/canvas.cpp b/src/canvas.cpp
index f73cc191..514184c1 100644
--- a/src/canvas.cpp
+++ b/src/canvas.cpp
@@ -267,39 +267,6 @@ std::vector<CanvasMode*> Canvas::modes[] = {
     { new CanvasModeMaskLine, new CanvasModeBasicCamera },  // mask-poly
     { new CanvasModeFloodFill, new CanvasModeBasicCamera },  // flood-fill
 };
-glm::vec3 Canvas::m_plane_origin[6] = {
-    { 0, 0,-1}, // front
-    { 1, 0, 0}, // right
-    { 0, 0, 1}, // back
-    {-1, 0, 0}, // left
-    { 0, 1, 0}, // top
-    { 0,-1, 0}, // bottom
-};
-glm::vec3 Canvas::m_plane_normal[6] = {
-    { 0, 0, 1}, // front
-    {-1, 0, 0}, // right
-    { 0, 0,-1}, // back
-    { 1, 0, 0}, // left
-    { 0,-1, 0}, // top
-    { 0, 1, 0}, // bottom
-};
-glm::vec3 Canvas::m_plane_tangent[6] = {
-    {0, 1, 0}, // front
-    {0, 1, 0}, // right
-    {0, 1, 0}, // back
-    {0, 1, 0}, // left
-    {0, 0,-1}, // top
-    {0, 0, 1}, // bottom
-};
-// only rotation
-glm::mat4 Canvas::m_plane_transform[6] = {
-    glm::lookAt(glm::vec3(), { 0, 0,-1}, {0, 1, 0}), // front
-    glm::lookAt(glm::vec3(), {-1, 0, 0}, {0, 1, 0}), // right
-    glm::lookAt(glm::vec3(), { 0, 0, 1}, {0, 1, 0}), // back
-    glm::lookAt(glm::vec3(), { 1, 0, 0}, {0, 1, 0}), // left
-    glm::lookAt(glm::vec3(), { 0, 1, 0}, {0, 0,-1}), // top
-    glm::lookAt(glm::vec3(), { 0,-1, 0}, {0, 0, 1}), // bottom
-};
 
 void Canvas::stroke_end() { pp::panopainter::legacy_canvas_stroke_end(*this); }
 void Canvas::stroke_cancel() { pp::panopainter::legacy_canvas_stroke_cancel(*this); }
diff --git a/src/legacy_brush_preset_list_services.cpp b/src/legacy_brush_preset_list_services.cpp
new file mode 100644
index 00000000..0fe8b2b2
--- /dev/null
+++ b/src/legacy_brush_preset_list_services.cpp
@@ -0,0 +1,98 @@
+#include "pch.h"
+
+#include "legacy_brush_preset_list_services.h"
+
+#include "canvas.h"
+#include "legacy_ui_overlay_services.h"
+
+namespace pp::panopainter {
+
+LegacyBrushPresetListServices::LegacyBrushPresetListServices(NodePanelBrushPreset& owner)
+    : owner_(owner)
+{
+}
+
+pp::foundation::Status LegacyBrushPresetListServices::add_current_brush_preset(int target_index)
+{
+    if (target_index < 0) {
+        return pp::foundation::Status::out_of_range("brush preset add target is invalid");
+    }
+    if (!Canvas::I || !Canvas::I->m_current_brush) {
+        return pp::foundation::Status::invalid_argument("current brush must be available to add a preset");
+    }
+
+    for (auto p : NodePanelBrushPreset::s_panels) {
+        p->add_brush(std::make_shared<Brush>(*Canvas::I->m_current_brush));
+    }
+    return pp::foundation::Status::success();
+}
+
+void LegacyBrushPresetListServices::remove_brush_preset(
+    int current_index,
+    int target_index,
+    bool selects_target,
+    bool clears_selection)
+{
+    for (auto p : NodePanelBrushPreset::s_panels) {
+        if (current_index < 0 || current_index >= static_cast<int>(p->m_container->m_children.size())) {
+            continue;
+        }
+
+        const bool new_current = !p->m_current || p->m_container->get_child_index(p->m_current) == current_index;
+        pp::panopainter::destroy_legacy_node(*p->m_container->m_children[current_index]);
+        if (clears_selection) {
+            p->m_current = nullptr;
+        } else if (new_current && selects_target) {
+            p->m_current = static_cast<NodeBrushPresetItem*>(p->m_container->m_children[target_index].get());
+            p->m_current->m_selected = true;
+        }
+    }
+}
+
+void LegacyBrushPresetListServices::move_brush_preset(int from_index, int to_index)
+{
+    for (auto p : NodePanelBrushPreset::s_panels) {
+        if (from_index >= 0 && from_index < static_cast<int>(p->m_container->m_children.size())) {
+            p->m_container->move_child(p->m_container->m_children[from_index].get(), to_index);
+        }
+    }
+}
+
+void LegacyBrushPresetListServices::select_brush_preset(int index, bool notify_brush_changed)
+{
+    for (auto p : NodePanelBrushPreset::s_panels) {
+        if (p->m_current) {
+            p->m_current->m_selected = false;
+        }
+        p->m_current = static_cast<NodeBrushPresetItem*>(p->m_container->get_child_at(index));
+        p->m_current->m_selected = true;
+        p->m_interacted = true;
+    }
+    if (notify_brush_changed && owner_.on_brush_changed) {
+        owner_.on_brush_changed(&owner_, owner_.m_current->m_brush);
+    }
+}
+
+void LegacyBrushPresetListServices::clear_brush_presets(bool clears_selection)
+{
+    for (auto p : NodePanelBrushPreset::s_panels) {
+        p->m_container->remove_all_children();
+        if (clears_selection) {
+            p->m_current = nullptr;
+        }
+    }
+}
+
+void LegacyBrushPresetListServices::update_preset_empty_notification()
+{
+    for (auto p : NodePanelBrushPreset::s_panels) {
+        p->m_notification->SetVisibility(p->m_container->m_children.size() == 0);
+    }
+}
+
+void LegacyBrushPresetListServices::save_preset_list()
+{
+    owner_.save();
+}
+
+} // namespace pp::panopainter
diff --git a/src/legacy_brush_preset_list_services.h b/src/legacy_brush_preset_list_services.h
new file mode 100644
index 00000000..87b821de
--- /dev/null
+++ b/src/legacy_brush_preset_list_services.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#include "app_core/brush_ui.h"
+#include "node_panel_brush.h"
+
+namespace pp::panopainter {
+
+class LegacyBrushPresetListServices final : public pp::app::BrushPresetListServices {
+public:
+    explicit LegacyBrushPresetListServices(NodePanelBrushPreset& owner);
+
+    pp::foundation::Status add_current_brush_preset(int target_index) override;
+    void remove_brush_preset(
+        int current_index,
+        int target_index,
+        bool selects_target,
+        bool clears_selection) override;
+    void move_brush_preset(int from_index, int to_index) override;
+    void select_brush_preset(int index, bool notify_brush_changed) override;
+    void clear_brush_presets(bool clears_selection) override;
+    void update_preset_empty_notification() override;
+    void save_preset_list() override;
+
+private:
+    NodePanelBrushPreset& owner_;
+};
+
+} // namespace pp::panopainter
diff --git a/src/legacy_canvas_plane_data.cpp b/src/legacy_canvas_plane_data.cpp
new file mode 100644
index 00000000..3e8442d2
--- /dev/null
+++ b/src/legacy_canvas_plane_data.cpp
@@ -0,0 +1,39 @@
+#include "pch.h"
+#include "canvas.h"
+
+glm::vec3 Canvas::m_plane_origin[6] = {
+    { 0, 0,-1}, // front
+    { 1, 0, 0}, // right
+    { 0, 0, 1}, // back
+    {-1, 0, 0}, // left
+    { 0, 1, 0}, // top
+    { 0,-1, 0}, // bottom
+};
+
+glm::vec3 Canvas::m_plane_normal[6] = {
+    { 0, 0, 1}, // front
+    {-1, 0, 0}, // right
+    { 0, 0,-1}, // back
+    { 1, 0, 0}, // left
+    { 0,-1, 0}, // top
+    { 0, 1, 0}, // bottom
+};
+
+glm::vec3 Canvas::m_plane_tangent[6] = {
+    {0, 1, 0}, // front
+    {0, 1, 0}, // right
+    {0, 1, 0}, // back
+    {0, 1, 0}, // left
+    {0, 0,-1}, // top
+    {0, 0, 1}, // bottom
+};
+
+// only rotation
+glm::mat4 Canvas::m_plane_transform[6] = {
+    glm::lookAt(glm::vec3(), { 0, 0,-1}, {0, 1, 0}), // front
+    glm::lookAt(glm::vec3(), {-1, 0, 0}, {0, 1, 0}), // right
+    glm::lookAt(glm::vec3(), { 0, 0, 1}, {0, 1, 0}), // back
+    glm::lookAt(glm::vec3(), { 1, 0, 0}, {0, 1, 0}), // left
+    glm::lookAt(glm::vec3(), { 0, 1, 0}, {0, 0,-1}), // top
+    glm::lookAt(glm::vec3(), { 0,-1, 0}, {0, 0, 1}), // bottom
+};
diff --git a/src/main.cpp b/src/main.cpp
index 62840991..80a13d1b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -152,19 +152,5 @@ int main(int argc, char** argv)
 
 int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
 {
-    int argc = 0;
-
-    // convert args from char to wchar
-    auto wargs = CommandLineToArgvW(GetCommandLine(), &argc);
-    auto argv = new char*[argc + 1];
-    for (int i = 0; i < argc; i++)
-    {
-        auto len = wcslen(wargs[i]) + 1;
-        argv[i] = new char[len];
-        wcstombs_s(nullptr, argv[i], len, wargs[i], len);
-    }
-
-    LocalFree(wargs);
-
-    return main(argc, argv);
+    return pp::platform::windows::run_winmain_entry(main);
 }
diff --git a/src/node_panel_brush.cpp b/src/node_panel_brush.cpp
index f62bf7d2..2591a47c 100644
--- a/src/node_panel_brush.cpp
+++ b/src/node_panel_brush.cpp
@@ -3,6 +3,7 @@
 #include "node_panel_brush.h"
 #include "legacy_brush_panel_ui.h"
 #include "legacy_brush_preset_panel_ui.h"
+#include "legacy_brush_preset_list_services.h"
 #include "legacy_brush_panel_services.h"
 #include "app_core/brush_ui.h"
 #include "legacy_brush_ui_services.h"
@@ -194,101 +195,6 @@ Node* NodePanelBrushPreset::clone_instantiate() const
 }
 
 namespace pp::panopainter {
-
-class LegacyBrushPresetListServices final : public pp::app::BrushPresetListServices {
-public:
-    explicit LegacyBrushPresetListServices(NodePanelBrushPreset& owner)
-        : owner_(owner)
-    {
-    }
-
-    pp::foundation::Status add_current_brush_preset(int target_index) override
-    {
-        if (target_index < 0) {
-            return pp::foundation::Status::out_of_range("brush preset add target is invalid");
-        }
-        if (!Canvas::I || !Canvas::I->m_current_brush) {
-            return pp::foundation::Status::invalid_argument("current brush must be available to add a preset");
-        }
-
-        for (auto p : NodePanelBrushPreset::s_panels) {
-            p->add_brush(std::make_shared<Brush>(*Canvas::I->m_current_brush));
-        }
-        return pp::foundation::Status::success();
-    }
-
-    void remove_brush_preset(
-        int current_index,
-        int target_index,
-        bool selects_target,
-        bool clears_selection) override
-    {
-        for (auto p : NodePanelBrushPreset::s_panels) {
-            if (current_index < 0 || current_index >= static_cast<int>(p->m_container->m_children.size())) {
-                continue;
-            }
-
-            const bool new_current = !p->m_current || p->m_container->get_child_index(p->m_current) == current_index;
-            pp::panopainter::destroy_legacy_node(*p->m_container->m_children[current_index]);
-            if (clears_selection) {
-                p->m_current = nullptr;
-            } else if (new_current && selects_target) {
-                p->m_current = static_cast<NodeBrushPresetItem*>(p->m_container->m_children[target_index].get());
-                p->m_current->m_selected = true;
-            }
-        }
-    }
-
-    void move_brush_preset(int from_index, int to_index) override
-    {
-        for (auto p : NodePanelBrushPreset::s_panels) {
-            if (from_index >= 0 && from_index < static_cast<int>(p->m_container->m_children.size())) {
-                p->m_container->move_child(p->m_container->m_children[from_index].get(), to_index);
-            }
-        }
-    }
-
-    void select_brush_preset(int index, bool notify_brush_changed) override
-    {
-        for (auto p : NodePanelBrushPreset::s_panels) {
-            if (p->m_current) {
-                p->m_current->m_selected = false;
-            }
-            p->m_current = static_cast<NodeBrushPresetItem*>(p->m_container->get_child_at(index));
-            p->m_current->m_selected = true;
-            p->m_interacted = true;
-        }
-        if (notify_brush_changed && owner_.on_brush_changed) {
-            owner_.on_brush_changed(&owner_, owner_.m_current->m_brush);
-        }
-    }
-
-    void clear_brush_presets(bool clears_selection) override
-    {
-        for (auto p : NodePanelBrushPreset::s_panels) {
-            p->m_container->remove_all_children();
-            if (clears_selection) {
-                p->m_current = nullptr;
-            }
-        }
-    }
-
-    void update_preset_empty_notification() override
-    {
-        for (auto p : NodePanelBrushPreset::s_panels) {
-            p->m_notification->SetVisibility(p->m_container->m_children.size() == 0);
-        }
-    }
-
-    void save_preset_list() override
-    {
-        owner_.save();
-    }
-
-private:
-    NodePanelBrushPreset& owner_;
-};
-
 } // namespace pp::panopainter
 
 void NodePanelBrushPreset::execute_preset_list_plan(const pp::app::BrushPresetListPlan& plan)
diff --git a/src/platform_windows/windows_bootstrap_helpers.cpp b/src/platform_windows/windows_bootstrap_helpers.cpp
index da78f921..f1653137 100644
--- a/src/platform_windows/windows_bootstrap_helpers.cpp
+++ b/src/platform_windows/windows_bootstrap_helpers.cpp
@@ -112,6 +112,24 @@ void ensure_runtime_data_directory()
     LOG("data files ok");
 }
 
+int run_winmain_entry(int (*entry_point)(int, char**))
+{
+    int argc = 0;
+
+    auto wargs = CommandLineToArgvW(GetCommandLine(), &argc);
+    auto argv = new char*[argc + 1];
+    for (int i = 0; i < argc; i++)
+    {
+        auto len = wcslen(wargs[i]) + 1;
+        argv[i] = new char[len];
+        wcstombs_s(nullptr, argv[i], len, wargs[i], len);
+    }
+
+    LocalFree(wargs);
+
+    return entry_point(argc, argv);
+}
+
 void setup_exception_handler()
 {
     // Setup exception handler
diff --git a/src/platform_windows/windows_bootstrap_helpers.h b/src/platform_windows/windows_bootstrap_helpers.h
index 3b50962b..67df88c0 100644
--- a/src/platform_windows/windows_bootstrap_helpers.h
+++ b/src/platform_windows/windows_bootstrap_helpers.h
@@ -48,6 +48,7 @@ enum class MainStartupResult
 
 void ensure_runtime_data_directory();
 void setup_exception_handler();
+int run_winmain_entry(int (*entry_point)(int, char**));
 MainWindowStartupState initialize_main_window_startup_state();
 void create_main_window(const MainWindowStartupState& startup, HWND& hWnd, HINSTANCE hInst, const wchar_t* window_title);
 void initialize_pixel_format_descriptor(PIXELFORMATDESCRIPTOR& pixel_format);