First pass at proper prototype

Well, that didn't work so good. the base part was overly long, lots of holes needed to be drilled to access construction screws, and the anti-backlash bands didn't fit. Darn. I've reworked it, and the reworked version with holes already in it and a bit more reinforcement etc. is now printing. Also, I blew a stepper controller. More updates when the next print is completed.