diff --git a/inventory.nix b/inventory.nix
index f292de7..f4763d0 100644
--- a/inventory.nix
+++ b/inventory.nix
@@ -1,72 +1,78 @@
+# ============================================================================
+# Fleet Inventory
+# ============================================================================
+# Top-level keys are ALWAYS hostname prefixes. Actual hostnames are generated
+# from the devices map or count.
+#
+# Hostname generation rules:
+# - Numeric suffixes: no dash (e.g., "nix-surface1", "nix-surface2")
+# - Non-numeric suffixes: add dash (e.g., "nix-surface-alpha", "nix-surface-beta")
+# - Set athenix.host.useHostPrefix = false to use suffix as full hostname
+#
+# Format:
+#   "prefix" = {
+#     type = "nix-desktop";        # Optional: defaults to prefix name
+#     system = "x86_64-linux";     # Optional: default is x86_64-linux
+#
+#     # Option 1: Simple count (quick syntax)
+#     devices = 5;                 # Creates: prefix1, prefix2, ..., prefix5
+#
+#     # Option 2: Explicit count
+#     count = 5;                   # Creates: prefix1, prefix2, ..., prefix5
+#
+#     # Option 3: Default count (for groups with mixed devices)
+#     defaultCount = 3;            # Creates default numbered hosts
+#
+#     # Option 4: Named device configurations
+#     devices = {
+#       "1" = { ... };             # Creates: prefix1
+#       "alpha" = { ... };         # Creates: prefix-alpha
+#       "custom" = {               # Creates: custom (no prefix)
+#         athenix.host.useHostPrefix = false;
+#       };
+#     };
+#
+#     # Common config for all devices in this group
+#     overrides = {
+#       athenix.users.user1.enable = true;  # Applied to all devices in this group
+#       # ... any other config
+#     };
+#   };
+#
+# Convenience options:
+#   athenix.forUser = "username";  # Automatically enables user (sets athenix.users.username.enable = true)
+#
+# External modules (instead of config):
+#   Device values can be a config attrset with an optional 'external' field:
+#   devices."hostname" = {
+#     external = builtins.fetchGit { ... };  # Lazy: only fetched when building this host
+#     # ... additional config options
+#   };
+#   The external module will be imported and evaluated only when this specific host is built.
+#
+# Examples:
+#   "lab" = { devices = 3; };                           # Quick: lab1, lab2, lab3
+#   "lab" = { count = 3; };                             # Same as above
+#   "kiosk" = {
+#     defaultCount = 2;                                 # kiosk1, kiosk2 (default)
+#     devices."special" = {};                           # kiosk-special (custom)
+#   };
+#   "laptop" = {
+#     devices = 5;
+#     overrides.athenix.users.student.enable = true;     # All 5 laptops get this user
+#   };
+#   "wsl" = {
+#     devices."alice".athenix.forUser = "alice123";       # Sets up for user alice123
+#   };
+#   "external" = {
+#     devices."remote".external = builtins.fetchGit {     # External module via Git (lazy)
+#       url = "https://github.com/example/config";
+#       rev = "e1ccd7cc3e709afe4f50b0627e1c4bde49165014";
+#     };
+#   };  
+
 {
-  # ============================================================================
-  # Fleet Inventory
-  # ============================================================================
-  # Top-level keys are ALWAYS hostname prefixes. Actual hostnames are generated
-  # from the devices map or count.
-  #
-  # Hostname generation rules:
-  # - Numeric suffixes: no dash (e.g., "nix-surface1", "nix-surface2")
-  # - Non-numeric suffixes: add dash (e.g., "nix-surface-alpha", "nix-surface-beta")
-  # - Set athenix.host.useHostPrefix = false to use suffix as full hostname
-  #
-  # Format:
-  #   "prefix" = {
-  #     type = "nix-desktop";        # Optional: defaults to prefix name
-  #     system = "x86_64-linux";     # Optional: default is x86_64-linux
-  #
-  #     # Option 1: Simple count (quick syntax)
-  #     devices = 5;                 # Creates: prefix1, prefix2, ..., prefix5
-  #
-  #     # Option 2: Explicit count
-  #     count = 5;                   # Creates: prefix1, prefix2, ..., prefix5
-  #
-  #     # Option 3: Default count (for groups with mixed devices)
-  #     defaultCount = 3;            # Creates default numbered hosts
-  #
-  #     # Option 4: Named device configurations
-  #     devices = {
-  #       "1" = { ... };             # Creates: prefix1
-  #       "alpha" = { ... };         # Creates: prefix-alpha
-  #       "custom" = {               # Creates: custom (no prefix)
-  #         athenix.host.useHostPrefix = false;
-  #       };
-  #     };
-  #
-  #     # Common config for all devices in this group
-  #     overrides = {
-  #       athenix.users.user1.enable = true;  # Applied to all devices in this group
-  #       # ... any other config
-  #     };
-  #   };
-  #
-  # Convenience options:
-  #   athenix.forUser = "username";  # Automatically enables user (sets athenix.users.username.enable = true)
-  #
-  # External modules (instead of config):
-  #   Device values can be either a config attrset OR a fetchGit/fetchurl call
-  #   that points to an external Nix module. The module will be imported and evaluated.
-  #
-  # Examples:
-  #   "lab" = { devices = 3; };                           # Quick: lab1, lab2, lab3
-  #   "lab" = { count = 3; };                             # Same as above
-  #   "kiosk" = {
-  #     defaultCount = 2;                                 # kiosk1, kiosk2 (default)
-  #     devices."special" = {};                           # kiosk-special (custom)
-  #   };
-  #   "laptop" = {
-  #     devices = 5;
-  #     overrides.athenix.users.student.enable = true;     # All 5 laptops get this user
-  #   };
-  #   "wsl" = {
-  #     devices."alice".athenix.forUser = "alice123";       # Sets up for user alice123
-  #   };
-  #   "external" = {
-  #     devices."remote" = builtins.fetchGit {            # External module via Git
-  #       url = "https://github.com/example/config";
-  #       rev = "e1ccd7cc3e709afe4f50b0627e1c4bde49165014";
-  #     };
-  #   };  # ========== Lab Laptops ==========
+  # ========== Lab Laptops ==========
   # Creates: nix-laptop1, nix-laptop2
   # Both get hdh20267 user via overrides
   nix-laptop = {
@@ -120,7 +126,7 @@
           };
         };
       };
-      "usda-dash" = builtins.fetchGit {
+      "usda-dash".external = builtins.fetchGit {
         url = "https://git.factory.uga.edu/MODEL/usda-dash-config.git";
         rev = "dab32f5884895cead0fae28cb7d88d17951d0c12";
         submodules = true;
@@ -146,34 +152,4 @@
   # ========== Ephemeral/Netboot System ==========
   # Creates: nix-ephemeral1
   nix-ephemeral.devices = 1;
-
-  # ========== Example: External Module Configurations ==========
-  # Uncomment to use external modules from Git repositories:
-  #
-  # external-systems = {
-  #   devices = {
-  #     # Option 1: fetchGit with specific revision (recommended for reproducibility)
-  #     "prod-server" = builtins.fetchGit {
-  #       url = "https://github.com/example/server-config";
-  #       rev = "e1ccd7cc3e709afe4f50b0627e1c4bde49165014";  # Full commit hash
-  #       ref = "main";              # Optional: branch/tag name
-  #     };
-  #
-  #     # Option 2: fetchGit with latest from branch (less reproducible)
-  #     "dev-server" = builtins.fetchGit {
-  #       url = "https://github.com/example/server-config";
-  #       ref = "develop";
-  #     };
-  #
-  #     # Option 3: fetchTarball for specific release
-  #     "test-server" = builtins.fetchTarball {
-  #       url = "https://github.com/example/server-config/archive/v1.0.0.tar.gz";
-  #       sha256 = "sha256:0000000000000000000000000000000000000000000000000000";
-  #     };
-  #
-  #     # Option 4: Mix external module with local overrides
-  #     # Note: The external module's default.nix should export a NixOS module
-  #     # that accepts { inputs, ... } as parameters
-  #   };
-  # };
 }