Update: I re-did the whole remixing in OnShape, the first one is made in tinkercad which is kinda jank.
This model now should fit any kind of pi without having to cut off the IO part,
The BigTreeTech Pi should also mount with 3 screws.
This is a remix of a model on Thingiverse if you want to see the original model see this link
if you need a screen mount see the design I made here
(Update: ABS is a must, I have my PETG case deform with the stress from the cables, screws and the heat)
The author remixed this model.
removed the display mount at the pi side, and patch up fan/screen cable hole
added a model with the Pi IO rotated to the front for easy access to Ethernet and USB ports.
added files for laser cutting the lid with acrylic for those who wish to show off their expensive mainboard.