This a hardware-free version of inhale3D's tablet stand. It has integrated perma-snap pins instead of bolts and nuts, so you just PRINT and SNAP.
I'm not very good with OpenSCAD, and I can't open the source drawings, but giving this a try. It seems that after printing, everything snaps together pretty well.
I used the OpenSCAD Pins library here to add pins:
It's super handy.