This Rack Mount allows for the mounting of an Alienware Alpha to a standard 10" rack. I'm using the LabRax system, but it should be compatible with various models. It should only need supports on the undersides of the vent gap and the ends. I recommend printing bolt-holes down. I used ASA, but it shouldn't matter what filament you use, so long as your printer is tuned.

Keep in mind the Alpha only gets air from the gaps on the sides - the underside vent is only for the drive and doesn't actually provide cooling to the CPU or GPU. Make sure your rack doesn't prevent airflow from entering the side vents.