If I were to pursue an endeavor such as this one, my first consideration would be the total weight of a vehicle currently being built (like a Chevy Volt) and aim for that weight as a goal for the build.
In order for EV to be feasible,weight/power ratio needs to match. The engineers who designed the Volt already did that for you.
A light frame is where you will save the most weight. An S-10 frame likely will not fit that bill.
