I'd like to redirect this discussion, if possible, because I really think I've found what everyone is looking for.  Compufire has a '3Phase System' generator that will produce 40A for the Harley Davidson. See:

http://www.compufire.com

The Harley Davidson generators all use a rotor designed for a 1", 10-spline shaft, and they measure about 1" high.  The rotors have two small holes in the top side.

I propose that the stator be bolted securely to the backside of the PSRU, and the rotor attached to the flex plate with two small screws.  The screw just keep the rotor from moving back and forth.  The splines actually spin it.  The stator will have to have the coils redone with a fewer number of turns, and possibly a heavier guage wire, but it will only take a few experiments to get the proper voltage output at 6000RPM.

No belts.  Off-the-shelf parts.   Minimum weight.  No engine modifications.  No machine shop work.  More than enough electrons to run the entire ship.  What more could we ask for?