Running the dome...

Just looking at others solution for the dome... basically it goes something like this:

...and that is what makes the dome able to spin around and around and around... the bolts can't be to long as they will hinder the movement as you place it on the slipring.

The engine you can find here but also at alot of other places too:
https://www.amazon.com/12Vdc-Right-Angle-Drive-Electric/dp/B005IR1NBA/ref=sr_1_5?ie=UTF8&qid=1421189468&sr=8-5&keywords=seat%20motor

But there is some assembly required, so here is a basic tutorial from youtube:

Noted is that we will probably go in a different direction since these kinds of engines can be a bit loud, they have a high-pitch...so some kind of high-torque engine, we will get back to you on that one as we look into other solutions...