Hiho, Go over to Lenco Lovers and take a look at the PTP3 top plate, made to conquer the very problems you cite as regards idlers. I'm working on that one, too. You can have a used Lenco and a PTP3 for under $500.
Do you think one could just remove the motor assembly from the existing SP10 mkII, extend the cables that go to the motor from the underslung part of the power supply, and then mount the motor in a plinth? All you'd need to do would be to craft a top cover for the tray of parts that lies underneath in the stock unit. Could conceivably be done without any fancy new electronics. Or could it? Albert, did you think of that?
Do you think one could just remove the motor assembly from the existing SP10 mkII, extend the cables that go to the motor from the underslung part of the power supply, and then mount the motor in a plinth? All you'd need to do would be to craft a top cover for the tray of parts that lies underneath in the stock unit. Could conceivably be done without any fancy new electronics. Or could it? Albert, did you think of that?