These are pictures I've taken of wheels owned by two friends.
Of course they "totally" agreed with the dismantling of the units ;-)

 LWFF Wheel with cable- gearing and motor

 LWFF Processor board (front view)

 LWFF Pedal unit with pots

 MSFF Overview assembled

 MSFF Pedal unit w/soldered pots

 MSFF Motor w/optical sensor (slotted wheel)

 MSFF Gearing disassembled

 MSFF PCB, manufatured by Mitsumi (front view)

 MSFF PCB, manufatured by Mitsumi (back view)