I am not sure to well understand what you're looking for. But I rebuild the floor of my 1977 17' Boler
In my own one, the floor was a 3/4" plywood sandwitched between two fiberglass sheets. As the upper sheet was broken and there was humidity in the plywood, I cut it all along side walls and took it off to let the plywood dry. Then I added a 5/8" plywood sheet and an oakfinished floating planks floor. This raised the floor, so the curve can be hidden behind the wall/floor moulding.
You can see some pictures of the result on my website, at this address