This was definitely a worthwhile project. I found some well priced right angle 12 volt gear motors on E-bay, got some belts and pullies from SDP/SI, and some chain and sprockets from Princess Auto. The belts come off in a jiffy if I want to convert to manual operation. The z axis motor was a little slow so I added a DC- DC boost converter and cranked it up to 16.5 volts. It doesn't run for very long, so I don't think it will do it much harm. All three motors are controlled by pulse width modulators so I can adjust the speed as needed. I made a video, so I will post that up later.