Welcome to the FRF forum. I have not seen alot of posting here in this forum for this kind of work - but there are other forums that do. Check out the Popup Portal forum, people there are doing those kinds of repairs and post alot of pictures. They are rebuilding mostly colemans and jaycos, but I would think that the steps are pretty similar. It seems to get very involved.
Another forum to check out is Popup Explorer.
check with a rockwood dealer, they may be able to get you the parts for the bed rails and such.
HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Bruce" 2011 Dodge Durango V8 Hemi Crew
Just us gals (me, Sis and our daughters)
Traveled 19520 miles and 209 nights in 7 years and counting