Midwest Messerschmitt .40
I built two of them many years ago. They are a bit heavy but they fly great and the kits were outstanding. I had one with a Rossi .40 and the other with an OS .46. Any good .40 should be plenty of power.
Jim Finn, I imagine you've got your work cut out for you! Aerodynamically the airplane is probably a fine choice for electric but they are quite substantially overbuilt as I recall. Love to see the electric version when you get it finished.