Looks like a lot of fun! I wondered about something like this myself a while back and someone has gone and built one! Turn up the volume LOUD! I bet if you kept your foot out of it that it would still get pretty good mileage in the mid 30’s or so.
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Motorcycle Photo Of The Day 
THAT would’ve been a proper replacement for my Smart Motor after it broke down after 40.000 kms.
Kind of a waste of effort IMO. It certainly doesn’t look cool, it can’t handle very well, and you don’t have reverse. What the hell would you do with it?
Youtube “Smart Diablo”. As well, there are a few companies out there offering complete kits to slip in a ‘busa engine.