I mean, once the basic design is done it's no big deal to adapt the RP Pi5 version to Pi4. I have found online the Pi4 drawings and I can try to create a new layer for the Pi 4 even without having physical access to an unit.
Once I publish it you would have to print it through any printing service (...or a friend with a 3d printer).
Once I publish it you would have to print it through any printing service (...or a friend with a 3d printer).