This look's like the norm for these car's. Bought the hole inner rocker and cut it to slip into the non damaged rocker. I was surprised it slipped into the old rocker. Look's good keep up the good work.
That is the way to get it done. Never know unless you try. I did opt to get new quarter's. Still had to work on the metal where it met with the roof down the back window. Keep at it and you will get it. Russ.
These area's seem to be the norm for rust. Got a good look at mine when doing the wheel tub install. Passenger side put half the rocker in my self. Seen a lot when putting new quarter's on also. Your getting it done for sure. We have to do what ever it takes for sure. You are saving a lot of money doing the work.