What worries me is the many rust-worm that I meet under the paint. They can clean up nicely but they are almost everywhere
This is a pain to deal with but hopefully it will clean up without removing too much metal you will be good.
This is also something i harp on about with new panels especially Heritage as a lot of folk think the E coat on Heritage is really good. It is but really good at hiding spider tracks of rust hence why i always recommend removing all of the E coat.