Now that I've got a good handle on the electronics, I switched to SolidWorks for a bit of CAD prototyping. Bbot's chassis is nearly complete. The current design features a NEMA-17 mount, top deck, battery mount, and holes for a wire harness. The only thing I've got to figure out now is where to put the electronics. And for that matter, what form factor the electronics will be in.
So next I'm going to work on planning out the circuitry which should help inform the last component of the structure.