Heavily based on Guybrush_T's design, though I had no idea how to edit a model so I just referenced it and made mine from scratch; still felt I should give credit where credit is due!

Designed around ElectronShepherd's new DigitalGBS kit, which you can find here:
https://electron-shepherd.com/collections/all/products/digitalgbs

When printing, I set mine to not use supports for the nubs and the vents as they're both at ~45°'s, though your mileage may vary on that one.

The lid is designed to snap on securely; you can use a thin metal/plastic spudger around where the nubs/holes are to free it should you ever need to open it back up.

Four 4mm m3 Hex screws hold the mainboard in place.

You'll likely notice the HDMI port jutts out the back a bit; this was on purpose. I noticed in an earlier printing it would occasionally grip the HDMI cable too tight (likely a cable issue on my part) causing it to lift up the DigitalGBS board out of its socket; with it no longer flush/behind the casing, it catches the port, preventing it from accidentally being removed.

I personally made it with the power switch in mind due to the empty space where most would put the audio jacks, however I've included a version without it, as well as versions of both with or without small holes at the bottom side to attach little rubber feet to keep it from sliding around!

The power switch I used is a fairly common 2 pin Snap-On rocker switch; you can get these anywhere really but here's an Amazon link for the exact brand should you want/need one anyways:
https://a.co/d/fbdTuaw

Fair warning; it is a tight fit. I used pliers to fully set it in, hasn't moved an inch sense.