[JET]

It isn't super difficult to do, but it is time consuming. You will need a sacrificial headlight housing, drill the inlet hole then bondo the inside of it to the shape you want. Put a layer of cheap turtle wax car wax on it, then wipe it off and put a really thick layer on it leave it. Do the fiberglassing and the turtle wax is a decent release agent and will allow it to come out when it is dried.