how to fix this mess

I had to repair the left rear side of my Bigfoot due to water damage from a leaky sewer vent on the roof last year. It took me several hours to pull out the rotten backer board, a piece at a time. After cleaning the area as best as I could, I was able to push a pressure treated 2x6 into the area (actually two pieces). Then I re-attached the jack with new larger and longer screws. I took about 8 hours of work to get it right, but I feel it's probably stronger than original. Things get very difficult, though, if you can't get access to the back side to evaluate and work. I had to work at it through the access door for the sewer valves. Lots of cuts and scrapes to my hands and arms.