Hey Barnstormer -- welcome to the Forums!
A bunch of digital photos during disassembly can help any owner put things back together again. Search the forums on strap duplicator
to help you locate frame or underlying rivet holes as you try to fit new skin.
I don't know why you have so many holes inside. The semi-monocoque shell structure relies on both the inner and
outer skins being attached properly to give the entire shell the stiffness it needs. Partitions really do not figure into this equation. Are the rivet holes you have to fill related more to removed partitions?
Post some pictures and please tell us more...