Here's the initial mechanical design.
It's totally a "throw together" laser cutter design, using mostly components I have on hand and scrap acrylic.
The design is very definitely sub-standard, in both form and function. The critical parts are locations of the DC motor output shaft, and bearings. The surrounding frame is totally unimportant, and will be replaced with something pretty when I've proven the mechanicals.
Yeah, this is entirely made out of scrap-bin materials. Upcycling!
A timing belt from the motor shaft will drive the main shaft, upon which the PCB is mounted. I was planning to finish laser cutting the timing belt pulleys too, but then some friends showed up and we started drinking.