The first link is to Keith Hennesy, who presents the sort of discussion that perhaps only an engineer could love. It's for sure the greenies won't like it much.
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For my part, I don't see either on of these plans doing anything to really justify the cost.
NOTE: This thing is a Corbin Sparrow electric vehicle made near San Jose CA. It never did sell very well, and eventually was sold to Meyers Motors, and then faded out. One was available at the battery plant where I worked, but before my time there. My co-workers who got a chance to drive it described it as "scary" notably if the speed limit was over 40 mph. I liked the platform and thought it would be fun with enough power, and sure enough, the thing has been produced with the batteries removed, and replaced with a 1000cc Harley Davidson engine, which reputedly gives this little go-kart a top speed of 130 mph. Probably gets 50 mpg, too.