Yeah ! And he does Sketchup!
Here's a link.
http://www.grainger.com/Grainger/items/1LNG9
Now, these puppeis aren't cheap. but they would definately do the job. They are 17 RPM and reversible 12VDC. You could easily build a 12volt power supply and using SPST switches, controlled by a master DPDT switch, you could even have a decent control system. Using a 4" - 6" diameter PVC pipe would do for the "roller" you'd just need to fab a "
yoke" to hold each end of the pipe in place, then connect the motor shaft to a through shaft to provide the rotation. I could sketch something if you think this is inside your budget restraints. .