diff --git a/Cargo.toml b/Cargo.toml
index 93a4dd6..3a25e80 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,6 +36,7 @@ cgmath = "0.18.0"
 bytemuck = { version = "1.14.0", features = ["derive"] }
 texpresso = { version = "2.0.1", features = ["rayon"] }
 serde = "1.0.193"
+ahash = "0.8.6"
 
 url = { version = "2.5.0", optional = true, features = ["serde"] }
 toml = { version = "0.8.8", optional = true }
@@ -45,10 +46,9 @@ reqwest = { version = "0.11.23", optional = true, default-features = false, feat
 async-tempfile = { version = "0.5.0", optional = true }
 tower-http = { version = "0.5.0", optional = true, features = ["cors"] }
 http = { version = "1.0.0", optional = true }
-ahash = { version = "0.8.6", optional = true }
 
 [features]
-server = ["url", "toml", "axum", "tokio", "reqwest", "async-tempfile", "tower-http", "http", "ahash"]
+server = ["url", "toml", "axum", "tokio", "reqwest", "async-tempfile", "tower-http", "http"]
 
 [profile.dev.package."*"]
 opt-level = 2
diff --git a/assets.nix b/assets.nix
new file mode 100644
index 0000000..bbe2311
--- /dev/null
+++ b/assets.nix
@@ -0,0 +1,9 @@
+{fetchSteam}:
+fetchSteam {
+  name = "tf2-vpks";
+  appId = "440";
+  depotId = "441";
+  manifestId = "5382461088476630278"; # 22 December 2023 – 00:13:59 UTC
+  hash = "sha256-p8waSdyFTKSo7CKQAjAGhL4hGiacjU0M59z47VH1NwM=";
+  fileList = ["regex:(tf2|hl2)_(misc|textures)_.*\.vpk"];
+}
diff --git a/flake.nix b/flake.nix
index 29c860c..8df3ca6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,7 +11,7 @@
     cross-naersk.inputs.nixpkgs.follows = "nixpkgs";
     cross-naersk.inputs.naersk.follows = "naersk";
     steam-fetcher = {
-#      url = "github:nix-community/steam-fetcher";
+      #      url = "github:nix-community/steam-fetcher";
       url = "github:icewind1991/steam-fetcher/filelist";
       inputs.nixpkgs.follows = "nixpkgs";
     };
@@ -30,6 +30,7 @@
       overlays = [
         steam-fetcher.overlays.default
         (import rust-overlay)
+        (import ./overlay.nix)
       ];
       pkgs = (import nixpkgs) {
         inherit system overlays;
@@ -99,26 +100,20 @@
             });
           server = naersk'.buildPackage (nearskOpt
             // {
-               pname = "vbsp-server";
-               preConfigure = ''
+              pname = "vbsp-server";
+              preConfigure = ''
                 cargo_build_options="--features server $cargo_build_options"
-               '';
-               GLTFPACK = "${pkgs.meshoptimizer}/bin/gltfpack";
+              '';
+              GLTFPACK = "${pkgs.meshoptimizer}/bin/gltfpack";
             });
-          assets = pkgs.fetchSteam {
-            name = "tf2-vpks";
-            appId = "440";
-            depotId = "441";
-            manifestId = "5382461088476630278"; # 22 December 2023 – 00:13:59 UTC
-            hash = "sha256-p8waSdyFTKSo7CKQAjAGhL4hGiacjU0M59z47VH1NwM=";
-            fileList = ["regex:(tf2|hl2)_(misc|textures)_.*\.vpk"];
-          };
+          assets = pkgs.vbsp-server-assets;
           server-with-assets = server.overrideAttrs (old: {
-            buildInputs = server.buildInputs ++ [ pkgs.makeWrapper ];
+            buildInputs = server.buildInputs ++ [pkgs.makeWrapper];
             postInstall = ''
               wrapProgram "$out/bin/vbsp-server" --set TF_DIR "${assets}"
             '';
           });
+          vbsp-server = pkgs.vbsp-server;
           default = vbsp-to-gltf;
         };
 
@@ -142,5 +137,8 @@
           nativeBuildInputs = [msrvToolchain] ++ tools;
         };
       };
-    });
+    })
+    // {
+      overlays.default = import ./overlay.nix;
+    };
 }
diff --git a/overlay.nix b/overlay.nix
new file mode 100644
index 0000000..7add0db
--- /dev/null
+++ b/overlay.nix
@@ -0,0 +1,4 @@
+prev: final: {
+  vbsp-server = final.callPackage ./package.nix {};
+  vbsp-server-assets = final.callPackage ./assets.nix {};
+}
diff --git a/package.nix b/package.nix
new file mode 100644
index 0000000..12562d3
--- /dev/null
+++ b/package.nix
@@ -0,0 +1,19 @@
+{
+  stdenv,
+  rustPlatform,
+  lib,
+}: let
+  inherit (lib.sources) sourceByRegex;
+  src = sourceByRegex ./. ["Cargo.*" "(src|derive|benches|tests|examples.*)(/.*)?"];
+in
+  rustPlatform.buildRustPackage rec {
+    name = "vbsp-server";
+    version = "0.1.0";
+
+    inherit src;
+
+    cargoLock = {
+      lockFile = ./Cargo.lock;
+    };
+    buildFeatures = [ "server" ];
+  }
diff --git a/src/server/server.rs b/src/server/server.rs
index 523536f..ceedd55 100644
--- a/src/server/server.rs
+++ b/src/server/server.rs
@@ -44,7 +44,7 @@ fn default_port() -> u16 {
 }
 
 #[derive(Debug, Error)]
-enum ServerError {
+pub enum ServerError {
     #[error(transparent)]
     Convert(#[from] vbsp_to_gltf::Error),
     #[error(transparent)]