Monterey Montero

I have a 1995 Monterey Montero and the floor board is water log and needs to be replaced. I want to rebuild the floor myself but i don't know how to do it. Can anyone explain to me how to rebuild the floor?

 

The hard and messy job is to cut off the bad plywood. Keep it for a pattern to cut the new pieces. You need to grind off the edges where the cuts are to get the fiberglass to hold. The stringers may need replacement too. Often you can sister new ones on the outside and use the old ones to hold them while the fibergalss hardens. I suggest you get a book on fiberglassing if you are not familiar with it. They usually have photos that help a lot. It is nasty, smelly, itchy, toxic job.