Same as the other models, M3 machine screws for mounting, #6 x ½" (3mm x 10mm) wood screws for assembly. Raspberry Pi of course uses M2.5 screws for mounting so you'll need 4 of those as well. They thread right into the standoffs. You can install a molex female in the back for power. Sources on github.
These models should fit other computers that follow the same formfactor, specifically the le potato from librecomputer(3B Faceplate) has been tested and works.
See the rest of the collection here:
https://www.printables.com/@Beefdip_176978/collections/1432728
Github Page for the project with Openscad/Freecad Sources
https://github.com/Real-Time-Kodi/EuroServerRack/
The author remixed this model.
This was created by heavily modifying KronBjorn's scripts for their 6inch rack project.