More Astro Drive Bits

I'll be adding an aluminum plate to use as a tripod mount. The whole unit will be mobile and operate off a 12vdc auto battery. I now have to collect the parts for the stepper motor drive circuit. I plan on it being able to do full step, and half steps.
Plus I'm going to have a removable pully on the other end of the shaft. This will be used to power my "circus" fork mount I built, http://greyhoundman.blogspot.com/2008_07_01_archive.html That way I can use heavier scopes.