You can get a used Prius for around $11-13k (sans replacement battery) and if you're a resident of Illinois, you can get a brand-new Volt for only a few dollars more -- I think the state offers a $7,500 tax bonus on top of the fed subsidy. If I were to build my own DIY electric car, it would be identical to the Chevrolet Volt... a purely electric car that carries it's own generator (unlike a "hybrid" that uses both motors and batteries to move the car). I like the idea of the Volt, I just have no taste for GM's politics, lame-ass styling, or shitty union-dominated management.