Hi Guys.
Saw this thread and thought I would show you my solution, its need tidy and cheap if you can find the right mobility scooter (Must be a twin motor) so you can can have a motor on opposite sides of the dome, all the eclectics are from the scooter itself, dome even beeps when reversing. Drive are direct using rubber boat rollers pressed on the motor gearbox shafts and then they intern site on rollers so the weight of the dome its self provides the drive weight/ friction so nothing slips work as we say down here "Sweet as Bro" check out the link below for all the pictures.
Cheers
Steve
http://blue19.com/gallery5/v/scope_s...ite/?g2_page=6