NICE PROJECT!
This sure looks like a shitload of work to put into a project, but it looks like it's going to be worth it in the end for you! That little thing looks like it's going to be fun to drive...
It would depend on your bumper laws and if your allowed to have you tires exposed.
Mabe you could make a removeable rear bumper/fender assembly?
I'm pretty sure this is the case here...
In Minnesota, if I recall correctly (IIRC), to be street legal you cannot have your tires exposed out the sides to keep it street legal. I think there are also other regulations to keeping a 4x4 street legal, but I cannot remember them. I'd have to look it up. Each state/region is different.
Mike, do remember what the Minnesota laws are on this?