diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index 7c6bfd22..e04a1622 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -2138,18 +2138,25 @@ public sealed class GameWindow : IDisposable
                 }
             }
 
-            // Phase D.2b-A — placeholder inventory window. Starts HIDDEN; F12
-            // (InputAction.ToggleInventoryPanel) reveals it via the UiRoot window
-            // manager. Throwaway scaffolding: Sub-phase B replaces the body with the
-            // real gmInventoryUI (0x21000023) nested layout, keeping the same name.
-            var inventoryWindow = new AcDream.App.UI.UiNineSlicePanel(ResolveChrome)
+            // Phase D.2b-B — the real inventory window from LayoutDesc 0x21000023 (gmInventoryUI),
+            // via the LayoutImporter. The sub-window mount pulls in the nested paperdoll/backpack/
+            // 3D-items panels (Type-0 leaves inheriting BaseLayoutId 0x21000024/22/21). Starts
+            // HIDDEN; F12 toggles it via the window manager. Position is the dat's own (X=500,Y=138).
+            AcDream.App.UI.Layout.ImportedLayout? invLayout;
+            lock (_datLock)
+                invLayout = AcDream.App.UI.Layout.LayoutImporter.Import(
+                    _dats!, 0x21000023u, ResolveChrome, vitalsDatFont);
+            if (invLayout is not null)
             {
-                Left = 220, Top = 120, Width = 320, Height = 400,
-                Visible = false,
-            };
-            _uiHost.Root.AddChild(inventoryWindow);
-            _uiHost.RegisterWindow(AcDream.App.UI.WindowNames.Inventory, inventoryWindow);
-            Console.WriteLine("[D.2b-A] placeholder inventory window registered (F12 toggles).");
+                var inventoryWindow = invLayout.Root;
+                inventoryWindow.Visible = false;
+                inventoryWindow.Anchors = AcDream.App.UI.AnchorEdges.None;   // user-positioned
+                inventoryWindow.Draggable = true;
+                _uiHost.Root.AddChild(inventoryWindow);
+                _uiHost.RegisterWindow(AcDream.App.UI.WindowNames.Inventory, inventoryWindow);
+                Console.WriteLine("[D.2b-B] retail inventory window from LayoutDesc importer (0x21000023).");
+            }
+            else Console.WriteLine("[D.2b-B] inventory: LayoutDesc 0x21000023 not found.");
         }
 
         // Phase N.4+N.5 — WB rendering pipeline foundation. The modern path is