If that works I can then seal up the seams with some Bondo. Really I should pull off the"banana wrap" and loosen the belly pan there, to weld in a new outrigger and metal along the outside edge. But I don't weld.
SO I have to think outside the box on this one.
Luckily for me this is the only truly screwed up floor spot I found other than one under the tub where the roof vent had leaked..for a long time. That one was easier to fix and now is sealed up tightly.
I also used some wood hardener, and Bondo as needed around the edges in the main room, where they may ever have been a leak, or might be some time in the future. The living room floor is solid.
