I like your handiwork, Chris!
I recently had a linear actuator (link to data sheet below if you're wondering what they are) and a few Phidgets interface boards (similar to Arduino) left over from an engineering project, and built myself an isosceles barn door tracker.
http://www.firgelli.com/Uploads/L12_datasheet.pdf
The actuator was mounted in between the two planks of wood (opposite the hinge) and I wrote a small script to change the length of the actuator according to the sidereal rate (0.2 mm accuracy).
Upside: ridiculously easy to assemble. Downside: the actuator alone costs $90 USD!
I've since 'upgraded' to an NEQ6 mount
