I'll never complain about excess information... thanks for the schematic! Any chance you could explain the diode in parallel with the motor(s)? I suppose I don't understand it because I really don't understand inductive loads either. Please point me to a place to read up on this if it is too much to explain.
Also, electrons flow from s (source?) to d (drain?) in the MOSFET, but conceptually, I can think of current going from + to -, or drain -> source -> ground, right?