You have some good ideas there. It seems my biggest problem is that the 12 volt motor is solderd to the circuit board. It has to fit just like the oridginal. So the size and mounting is very important. Also the speed circuit is part of the board. The motor has just two solding tabs. Just 2 inputs, pos and neg. The circuit has adjustment for the speed. It looks like it has to be the panasonic motor made for the turntable. The year it made is from 1982 to 1984 or about. Here is the part number, SFMHB33-01E by Panasonic for Technics.