I have seen videos of people going over the changes in the JL where the hood, doors, windshield frame, and tailgate are all aluminum. I saw one that stated the fenders are as well but I am not sure about that.Aren't the body panels aluminum?
I have been thinking about doing the same with the fender welting.... if you look at old VW bugs it is the rubber between the fenders and body. Looks a lot like weather stripping or piping on leather seats.fender welting? show us some pictures of how that would work.