diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..c193d2f
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1 @@
+# TODO: Define the homelab NixOS flake.
diff --git a/home/admin.nix b/home/admin.nix
new file mode 100644
index 0000000..c6a7201
--- /dev/null
+++ b/home/admin.nix
@@ -0,0 +1 @@
+# TODO: Define admin Home Manager settings.
diff --git a/hosts/midgard/default.nix b/hosts/midgard/default.nix
new file mode 100644
index 0000000..f60f701
--- /dev/null
+++ b/hosts/midgard/default.nix
@@ -0,0 +1 @@
+# TODO: Define the midgard host.
diff --git a/hosts/midgard/disko.nix b/hosts/midgard/disko.nix
new file mode 100644
index 0000000..384843a
--- /dev/null
+++ b/hosts/midgard/disko.nix
@@ -0,0 +1 @@
+# TODO: Define the midgard disk layout.
diff --git a/hosts/midgard/hardware-configuration.nix b/hosts/midgard/hardware-configuration.nix
new file mode 100644
index 0000000..669fda2
--- /dev/null
+++ b/hosts/midgard/hardware-configuration.nix
@@ -0,0 +1 @@
+# TODO: Replace with generated midgard hardware configuration.
diff --git a/hosts/yggdrasil/default.nix b/hosts/yggdrasil/default.nix
new file mode 100644
index 0000000..a0dfc2a
--- /dev/null
+++ b/hosts/yggdrasil/default.nix
@@ -0,0 +1 @@
+# TODO: Define the yggdrasil host.
diff --git a/hosts/yggdrasil/disko.nix b/hosts/yggdrasil/disko.nix
new file mode 100644
index 0000000..39fdf52
--- /dev/null
+++ b/hosts/yggdrasil/disko.nix
@@ -0,0 +1 @@
+# TODO: Define the yggdrasil disk layout.
diff --git a/hosts/yggdrasil/hardware-configuration.nix b/hosts/yggdrasil/hardware-configuration.nix
new file mode 100644
index 0000000..80f8e3e
--- /dev/null
+++ b/hosts/yggdrasil/hardware-configuration.nix
@@ -0,0 +1 @@
+# TODO: Replace with generated yggdrasil hardware configuration.
diff --git a/modules/base.nix b/modules/base.nix
new file mode 100644
index 0000000..bcfa03a
--- /dev/null
+++ b/modules/base.nix
@@ -0,0 +1 @@
+# TODO: Define common base system settings.
diff --git a/modules/gc.nix b/modules/gc.nix
new file mode 100644
index 0000000..790d589
--- /dev/null
+++ b/modules/gc.nix
@@ -0,0 +1 @@
+# TODO: Define garbage collection settings.
diff --git a/modules/ssh.nix b/modules/ssh.nix
new file mode 100644
index 0000000..b2505f9
--- /dev/null
+++ b/modules/ssh.nix
@@ -0,0 +1 @@
+# TODO: Define OpenSSH settings.
diff --git a/modules/tailscale.nix b/modules/tailscale.nix
new file mode 100644
index 0000000..fb79ec7
--- /dev/null
+++ b/modules/tailscale.nix
@@ -0,0 +1 @@
+# TODO: Define Tailscale settings.
diff --git a/modules/users.nix b/modules/users.nix
new file mode 100644
index 0000000..8a8c6c3
--- /dev/null
+++ b/modules/users.nix
@@ -0,0 +1 @@
+# TODO: Define users and SSH authorized keys.