And, where would you be buying the parts and battery packs necessary for an electric conversion?? I don't mean to be unkind, but unless you're an electrical engineer with experience in battery cars, where would you even start? The battery packs on those electric cars are pretty big and costly.
I wish you luck and appreciate you concern for the environment. However, I think this idea is kind of "pie in the sky" and is not very practical at all.
But, good luck if you can find the plans and parts to do such a thing.