Floor replacement

[NormanXanders]

Ok...here are some pics......ran into a issue that I need advice on, under the fuel tank I found that the fiberglass covering the spine was very flexible I opened up a small hole to look at it, there is moisture in there and the wood is soft on the top side. I checked the rest of the spine from there back to motor and it all seems very hard or just the fiberglass is hard, I never cut anymore glass to really look at it was hoping it was ok based on the fact that it is not loose like it is under tank...

Can part of the spine be replaced as long as its braced and attached to the other cut ends correctly?

I have some of the beginning pics, I will take more of the spine tomorrow to show...