EDIT: I'm currently working on a mITX case, all of my focus has been redirected tward it, go check it out https://www.reddit.com/r/pcmods/comments/cxrfne/custom_mitx_case_lasercut3dprinted_waiting_for/

This is my first version of this case, I was able to assemble it and everything fit nicely apart from a few slots where the motherboard was supposed to fit into the 3D printed corners (I just used a soldering iron with an old tip I didn't care about to open these slots up).

This case is pretty simple and should fit most computer parts. I cut up the case so it could be printed on most printers one part at a time, I recommend trying it out as it will only cost ~$10 of filament at most. If you have access to a laser cutter I highly recommend trying this out and making your own design.

If you're trying it out make sure your power supply has a footprint that of mine or smaller, I have an EVGA 750 B3. All 120mm fans should fit, all standard motherboards should fit, and it was designed to house a full-sized graphics card.

Things to note:
there is no SSD/HDD mount as of now, laser cut pieces will take a very small amount of sanding to get to pop into place, all bolts that hold the case together are 4M bolts. Use bolts to align the top and bottom plates with the side frames and super glue them together when they're aligned (the small tabs aren't designed to support a lot of weight plus the tabs on the back near the power supply are very small and cant thread so it's required to glue these ones)

I'm currently building this case right now, I have a larger printer so I'm able to print the whole frame in just 6 pieces. It will look very nice once the frame is built (I'm re-printing the frame in black) and the wood panels are stained.