I picked up a Wonder partially completed with the fuselage already covered. I didn't like the covering job on it, so I stripped it off only to find that there is a sheet of metal laminated into the sides of the fuselage between 2 sheets of balsa. Is this how the kit is built, or did the builder add this? It sure does feel strong, but I don't even want to think about how much weight that added if it's not supposed to be there in the first place.