The saga of my junk rig.....I need suggestions....

You say you don't have leaks but have delaminating fiberglass and soggy floors.

So something isn't matching up here.

What you have is a maintenance mess that was allowed to continue and turn into a much bigger mess. You have to stop the leaks which physical evidence says are there. Then you can work on fixing the delamination and soggy floors and seal.

Short of you torching the place down, insurance isn't going to pay you a nickle because of long term seepage issues due to improper maintenance.