made some progress

systems/x86_64-linux/tulkas/README.md

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+# Description
+
+Steamdeck

systems/x86_64-linux/tulkas/default.nix

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+{ ... }:
+let
+in
+{
+  imports = [
+    ./disks.nix
+    ./hardware.nix
+  ];
+
+  sneeuwvlok = {
+    preset = "desktop";
+    desktop.use = "gamescope";
+  };
+
+  system.stateVersion = "23.11";
+}

systems/x86_64-linux/tulkas/disks.nix

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+{ config, lib, pkgs, modulesPath, ... }:
+let
+  inherit (lib.modules) mkDefault;
+in
+{
+  # TODO :: Implement disko at some point
+
+  swapDevices = [
+    { device = "/dev/disk/by-uuid/beddca5c-1ecc-4a46-9fc5-fd918eed8f2a"; }
+  ];
+  
+  fileSystems = {
+    "/" = { 
+      device = "/dev/disk/by-uuid/aa438c4c-d193-436b-91ca-c386c0688265";
+      fsType = "ext4";
+    };
+
+    "/boot" = {
+      device = "/dev/disk/by-uuid/89B8-0702";
+      fsType = "vfat";
+    };
+  };
+}

systems/x86_64-linux/tulkas/hardware.nix

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+{ config, lib, pkgs, modulesPath, system, ... }:
+let
+  inherit (lib.modules) mkDefault;
+in
+{
+  imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+
+  boot = {
+    initrd.availableKernelModules = [ "nvme" "xhci_pci" "usbhid" "usb_storage" "sd_mod" "sdhci_pci" ];
+    initrd.kernelModules = [ ];
+    kernelModules = [ "kvm-amd" ];
+    kernelParams = [];
+    extraModulePackages = [ ];
+  };
+
+  nixpkgs.hostPlatform = mkDefault system;
+  hardware.cpu.intel.updateMicrocode = mkDefault config.hardware.enableRedistributableFirmware;
+}