I think electric cars are cool... but the Midget is an extremely poor platform for such a conversion.
After dropping $8200 on that thing, you will probably get to drop another $5000 on batteries. In my limited research, it's generally when the batteries need to be replaced the SECOND time that people get motivated to sell their electric conversion.
From what I have read/heard, the Porsche 914 makes a great 'lectro conversion. Done correctly, the car can be capable of near 100 mph speeds and acceleration that will require you to collect your organs from the trunk.