diff --git a/bash/.bashrc b/bash/.bashrc
index d2cfc2f..305b787 100644
--- a/bash/.bashrc
+++ b/bash/.bashrc
@@ -3,4 +3,7 @@ eval "$(/usr/local/bin/brew shellenv)"
 
 
 
+# Machine-local overrides (survives devbox global pull)
+[ -f ~/.bashrc.local ] && source ~/.bashrc.local
+
 echo "Running .bashrc Scripts... Complete"
diff --git a/chezmoi/dot_zshrc b/chezmoi/dot_zshrc
index 280b6b0..75a5bb0 100644
--- a/chezmoi/dot_zshrc
+++ b/chezmoi/dot_zshrc
@@ -47,4 +47,5 @@ fi
 eval "$(direnv hook zsh)"
 test -e "$HOME/.shellfishrc" && source "$HOME/.shellfishrc"
 
-
+# Machine-local overrides (not managed by chezmoi, survives devbox global pull)
+[ -f ~/.zshrc.local ] && source ~/.zshrc.local
diff --git a/devbox.json b/devbox.json
index c27ea22..e7e30df 100644
--- a/devbox.json
+++ b/devbox.json
@@ -6,7 +6,7 @@
     "cmatrix@latest",
     "atuin@latest",
     "bat@latest",
-    "btop@latest",
+    "path:./#btop-gpu",
     "chezmoi@latest",
     "cloc@latest",
     "direnv@latest",
@@ -95,7 +95,7 @@
         "git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm"
       ],
       "install-chezmoi": [
-        "chezmoi purge --force && chezmoi init",
+        "chezmoi init || true",
         "cp -r $(devbox global path)/chezmoi/* $(chezmoi source-path)",
         "chezmoi apply --no-pager --progress true"
       ],
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..da9dffa
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,23 @@
+{
+  description = "Custom overrides for Devbox";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs {
+        inherit system;
+        config.allowUnfree = true;
+      };
+    in
+    {
+      packages.${system} = {
+        btop-gpu = pkgs.btop.override {
+          cudaSupport = true;
+        };
+      };
+    };
+}