Building an e-pusher for in town use wouldn't be for saving money. (The ForkenSwift will never pay for itself either, considering the car it's displacing.)
And it's not strictly for carbon eradication, though that's an attractive benefit.
It's more because it would be a cool project. And ... left over from project ForkenSwift I happen to have access to ...
(a) the needed batteries,
(b) an extra motor,
(c) a controller, and
(d) more contactors
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