I posted a similar thread about 6 months ago, called poor mans hybrid. obstacles would be for the end user, having to modulate two throttles. The guy putting it in himself wouldn't care. Not everyones a "mad scientist" so being user friendly would drive the cost and the research up, only afforded by the big car companies. I would totally go for one with a small ac motor in the back operated with a twist throttle, and relocate the e-brake handle or something.
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