---

What condition was the wood in? Did you replace any of it or inject/apply epoxy resin? Are you planning on adding additional wood? I don't know what this involves but my understanding is injecting/encasing the wood in epoxy is a good idea to prevent it from rotting or salvage it if partially rotted.

The way a pro told me to put back a panel when you only have access to one side was to do it similarly to a repair by removing an inch of foam a half inch deep under the edges and fill with mash prior to putting in the panel. Then do what you plan with the seams. I think an extra wide bevel could help as well. I would put a thin layer of mash on the back of the floor when you put it in to avoid air pockets. If the edges aren't quite even when dry-fitted, the mash will help hold them in place. You could screw in small boards on the edges if weights don't hold them in position. Weights worked well in my case (about 100 pounds distributed over a 3 by 1 area).

I suspect the preference for fixing from the inside is more important for repairs on the outside of the hull than the inside since there is so much more force but that is a guess.