Can anyone fix rear frame rails

checking out my frame rails today everything seems good except driver side rear under the muffler. its chipping off even a hole. any help?

is it flat sheet metal?

msg fastback 240

its flat hole right now but looks like the whole thing could burst into rusty bits. only on driver side. looks repairable though

message draggone

Me and Kengi might be able to do it, we need pictures though.

yo alex hit me up a pm i can do it for a good price and im fairly close to you