I ran into the same problem.I wasnt comfortable with soaking the wood to bend it.So I ended up inlaying the sheeting between the stringers. I liked the finished results.A little time consuming though. Measured the fore and aft gaps, and cut it slightly bigger and sanded to fit. I used tite bond instead of CA.Sanded it to a rounded shape.I was actually ashamed to cover it up.Looked to good to cover. I m sure it also saved a little bit of weight too.