diff --git a/TASKS.md b/TASKS.md
index ffa4326..3e1a01f 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -90,11 +90,7 @@ Propose TASK update
## LAYOUT SYSTEM
-- [ ] T106 Create Global Layout
-- [ ] T107 Create Navigation
-- [ ] T108 Create Mobile Navigation
-- [ ] T109 Create Document Layout
-- [ ] T110 Create Content Collection Routing
+- [x] T106 Create Site Shell
---
diff --git a/src/components/DesktopNav.astro b/src/components/DesktopNav.astro
new file mode 100644
index 0000000..4959722
--- /dev/null
+++ b/src/components/DesktopNav.astro
@@ -0,0 +1,19 @@
+---
+import { navItems } from '../lib/site';
+---
+
+
diff --git a/src/components/Footer.astro b/src/components/Footer.astro
new file mode 100644
index 0000000..59ba038
--- /dev/null
+++ b/src/components/Footer.astro
@@ -0,0 +1,9 @@
+---
+
+---
+
+
diff --git a/src/components/Header.astro b/src/components/Header.astro
new file mode 100644
index 0000000..f9fde53
--- /dev/null
+++ b/src/components/Header.astro
@@ -0,0 +1,18 @@
+---
+import DesktopNav from './DesktopNav.astro';
+import MobileNav from './MobileNav.astro';
+---
+
+
+ Document +
++ {description} +
+This document is available once the collection publish content.
++ No content has been added yet for {collectionTitle}. This collection route + is ready for future documents. +
++ Documentation shell +
++ This foundation provides shared layout, navigation, and content collection + routing for the REPL Works platform. +
++ This page is a placeholder for the Why section. The shared site shell is + configured and ready for content. +
+