Don, the crank taper for the alt is cut off and 3/16" flat alum used for a cover just to protect the engine cases. Right side I mounted the ignition bits "inside" the stock ign plate so that cover too can be very nearly flat.
Rocket, I think Scotty uses AirTech but if I'm not mistaken those are designed for the 750 and the lower is bulbous around that crank area on a 500. Yours being flat will look more slim there.
Did your guy have a mold of some kind?