I would suggest reading the following thread in the "Fossil Free Fuels" section of this forum:
MetroMPG's Project Forkenswift
Bens Electro-Metro
Paul and Sabrina's Super Beetle
Its a lot of reading (40+ pages each thread), but id say its worth it.
As said above - It comes down to cost and time. Id have built one by now but im also a student, and im broke too!
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