I wonder if the upper and lower halves are also fiberglassed together on the inside, perhaps behind the wood (I would think so).
Hi again, Raya -
My two halves weren't fiberglassed together. They just line up one over the other. Actually when I removed my belly band the first time the top half dropped about 1/8" - a bit of a pain to line up the holes again. I replaced the wood 'inner' band, so all of my holes are fresh. Good call on filling them though if worn a bit. I think I"ll just be butyl-ing and/or a good caulk as you say.
When I went to remove my uppers, the PO had put long carriage bolts through the cabinets and out through the roof. He finished the job off with a nice 'bee-hive' of caulk, a good 3" high - one in each of the four corners on the roof. I had always wondered what the heck those were
I realized by the end of my demo that the wood cabinet supports, like yours, were just glued to the inside of the fiberglass
- what the ! Some almost fell off when I took the cabinets off. So when I stripped the walls down, I traced around these with a Sharpie, and sanded a good 6" around them to remove the pink glue. I cut new wood while replacing the belly band inner. Again, these had to be cut every few inches in some spots almost all the way through (I still don't know what carpenters call this) but it allowed the wood to follow the contours of the trailer. I rubber cemented all my wood in first to keep it in place, and then just used strips of fiberglass
to tab over the wood, attaching it to the trailer wall. It wasn't the neatest of jobs, but it'll stay. That's all covered by the hull liner fabric, which, by the way, covers over contours very well. It has some give to it as it's fibrous. Imagine the consistency of an SOS pad - lots of give in terms of stretching and following odd shapes.
Sounds like you've got things all in line for your trailer!