Lovely scope Dan!!
One of the issues with the Mel Bartels system is that it requires a computer and the servocat is a bit pricey. Something that's quite new to the market is the rDuinoscope DIY. Costs about $200-$300 for parts. I've got the parts on order and it'll probably take a few weeks to learn to debug all the programming. Hopefully that'll be long enough for the inventor/some other guru to amend the progamming for an alt/az mount.
http://rduinoscope.byethost24.com