I always recommend that people start with the EV Album.
EV Photo Album: Our Electric Cars on the Web
It is a great listing of LOTS of electric vehicles, 90% of them being home conversions.
Each entry is a simple listing of a photo or two, what motor, batteries, controller, cost, etc.
Just by looking at what everyone else has done can give you a great idea of what to expect in terms of range, cost, how long it takes to convert, etc.