It's ALIVE
I stuck a couple of tiny magnets under the cog so they pass over a reed switch to form a simple encoder. I got the electronics into a box, put a switch on the front for manual control and ran some wires to the home sensor, encoder, PC, power and the motor.
The dome slot follows the scope during a slew so it's definately a goer
Now, some stars would be nice so I can tune up the numbers in the lesve dome driver software to get it as accurate as I can.
It's an easter miracle