Mark,

Looking forward to your pics!

No problem asking about your stab. It's all Tiger Tail!

One possibility to repair the loose sheeting would be to use a syringe with a nice sharp needle and inject some slow cure epoxy into the cavity. Once the epoxy is in then add some weight to hold down the sheeting until it cures. You could use a pin to poke a few tiny holes through the sheeting along the length of the cavity to gauge the flow of the epoxy plus the holes would let any trapped air escape as the epoxy goes in. I think this might be the least invasive way to go.

RG