After much cleaning and fighting rusted screws I finally got the floor replaced. I only cut out enough to remove the rotten parts but still be stable. I cleaned and painted the rusted parts of the frame and sealed up some gaps with foam sealer. I used some caulk around the seams of the new pieces and then sealed it up with rustoleum undercoating. Turned out pretty good I think. Now I have to build back the box frame that was behind the couch and then get the carpet. Sure has been alot of work but I am happy with it so far.
I apologize for the low quality cell phone pics. I was too tired to get my good camera.

