Yeah, I understand the height issue.
If it wasn't for my roof raise I wouldn't have insulated the floor.
They do make some interesting roll sheet insulation with reflective material that might be perfect for the roof of the bays though.
I used that 3M marine sealant to bond the replacement pieces I put into fill some of the holes in the original floor from bay lights..bus plumbing etc... That stuff is awsome... It would be easier to cut a new hole than knock those pieces out..
Marble floors...No wonder that ferry was listing to the right in your pictures. Cliff