This is what I found when I removed rear section of the floor. The bottom is in excellent shape, but the wood was REAL wet and soggy. The rear section is good enough to use as a template though. Replacing is easier than drying it out. The wood was not treated, just plain. There were no cross joists either. The stringers run front to back, and the 'glass that held them in place is still there, but the wood was SO wet, it pulled right apart.