Something like a LP record turn table could do it, but you will have at the very least a spinning thin rod going up to the habitat ring possibly a complex system of belts and wheels hidden inside the ship could do it somehow. Or a diorama with stars on the back wall, put the rim of the habitat disc up against the star wall, have a small opening in the star wall and put all the mechanisms behind the wall and simply use a friction wheel turn the habitat ring, which will have to be made to spin like a wheel. micro motors and rattle gears could possibly do it with a direct drive micro motor and trap gear system???? i really don't know but the idea of doing that fascinates me.