Those rotisseries are cool. I went over to a coworkers house last week to get some ideas on building my own. He has a body on frame 69 GTX on his with everything on it minus engine and tranny. I was amazed when he grabbed the car and played "Wheel of Fortune". That thing spun at least 6 times before slowing down. Told him he was crazy. He has his set up so he can adjust the attachment point horizontally or vertically to get his center of gravity just so. I'm wanting one to make finish welding and clean up of the rolling chassis easier. Doubt I'll need anything too heavy duty.

Like you mentioned....you could used a gear reduction box but with a lever actuated slip coupler....coupled to an electric motor versus hydraulic. Keep the gearing low so it'll be slow. Could even reverse rotation.

David