The inner thumb key splits into two stacked keys, and the outer one moves into the matrix as col0's mod key.

Assisted-by: Claude Opus 5.5 via Claude Code

diff --git a/layout.yml b/layout.yml
index d4bdbca..4611616 100644
--- a/layout.yml
+++ b/layout.yml
@@ -17,7 +17,6 @@ points:
         padding: ky
       columns:
         col0:
-          rows.mod.skip: true
         col1.key.stagger: 4.5
         col2.key.stagger: 5.5
         col3.key.stagger: -4.5
@@ -30,22 +29,18 @@ points:
     thumb:
       anchor:
         ref: matrix_col0_bottom
-        shift: [-kx, -ky]
+        shift: [-kx, -1.25ky]
       key:
-        spread: kx
-        height: 1.5ky-0.5
+        padding: ky
       columns:
         inner:
-        outer.key.stagger: -0.25ky
       rows:
-        cluster:
+        bottom:
+        top:
   mirror:
     distance: -5
 outlines:
   caps:
     - what: rectangle
-      where: /matrix/
-      size: [kx-0.5, ky-0.5]
-    - what: rectangle
-      where: /thumb/
-      size: [kx-0.5, 1.5ky-0.5]
\ No newline at end of file
+      where: /matrix|thumb/
+      size: [kx-0.5, ky-0.5]
\ No newline at end of file