It's a damn shame that to make this thing street legal, you actually have to crash a bunch of them.
And building like 10 of them, is going to be a real issue.
Actually, you'd have to do more than that in order to make it street legal. It has no mirrors and no signal lights, for starters.
You wouldn't want it the way it was originally designed anyway, other than as something to look at. I've seen the original prop, and the inside was pretty barren. Other than the basic controls, a seat, and a seatbelt, the entire inside is pretty much just sheet aluminum. The guy I saw backing it off a trailer (with lots of help btw, as with no back window and no mirrors, he couldn't see WTF he was doing) was sweating his balls off in there, even with the top down, as it was the middle of summer, and there was no insulation between him and the heat of the engine, nor any air conditioning.
A prop-accurate Tumbler would pretty much only be good for a prop or a conversation piece.