I'm having a notion to do so too. But I have looked into the cost of controller and battery supply..all of a sudden the small block chevy engine build is inexpensive. I happen to be in Portland, Oregon so there seems to quite a group of people building electric cars and cycles that are used for racing. Most seem to be the light weight imports.
Try EVA news. is great source for technical information to get the main drive train together.
Have fun..keep us updated.