I like the 2-sided rear fender idea... but I'm trying to figure out the tailgate. Are you trying to make it functional? If yes, instead of cutting the fender profile into them and having a "jagged" tailgate, what about sectioning the inverted fender and attach it to the tailgate such that it tilts with the gate? Make sense? See line on pic... that would be the gap line in the inner fender and everything behind that would tilt with the tailgate. Maybe a little tough to deal with the 2 fenders mating with one another. OK... still thinking this through.