Thanks for the pics and detail Justin.
Pretty ingenious setup.
As for the tracking rate, I initially thought that the rate was constant as well, but learnt that there is a lot more to it and a few factors like refraction vary the tracking rate between objects near horizon and near zenith. Also King rate.
details in this thread, post 12,15 and 17
http://www.iceinspace.com.au/forum/s...+rate+tracking
autoguiding would compensate for changes.
I hadn't thought of keplers law though. will look it up.
what is the focal ratio for your scope?
what video camera do you use for your guiding scope?