Actually it might not be too bad provided what you use it for. My parents live in one of those "Sun City" retirement communities outside Phoenix, and darn near everybody uses their golf carts to run errands (Groceries, etc.) The carts ARE licensed using a motorcycle plate. I assume these could be licensed in the same way. Definitely not the same as our little Smarts, however.
By the way, not the first "Clone" I've seen either. Bombardier used to make a golf cart that also looked a little like a Smart (Except for no doors) Do a Google Image search for a Bombardier golf cart and you'll see what I mean.