I've seen some great fiberglass work on bike fairings, how easy it is depends on your skill set. I've made seat pans and a lumpy fender (glass over an existing fender as a mold). By the time I re-glassed the boo boos and bondo-ed the rest I could have made it out of cash. I do not have a clue how to approach something the size and complexity of a fairing. Denting, bending, fold, mutilate and rivet, that I can do. The key is to keep expectations low.