Purism has released the Librem 5's mechanical design, adding to already available schematics and PCB layouts.
https://source.puri.sm/Librem5/3D_designs/-/blob/master/Librem5-Chassis/librem-5.step
I think that may make it the first proper Open Hardware smartphone out there.
@kop316 Maybe? You've got the designs now. But I'm afraid I have no idea, I have never even 3D printed anything so far