Rust question

[isimon91]

So I bought my 14 this fall, previous owner said it had some body rust but nothing too bad.

Took a look underneath the car, frame rails look perfect, absolutely no rust.

Front wheel wells have beginnings of rust. Now what I didnt notice is what the sideskirts were covering, which was a pretty good sized hole right where the door meets the fender.

The stock sideskirts are all pretty much cancered out from the front wheel well, to the rear wheel well.

Owner also cut the old quarter panels out, and put overs on. Found out that underneath the overs, I can see into the car, and can see the speakers (aftermarket speakers are installed in the rear seat space on the side panels).

Structurally, is this fixable? Or should I start with a new chassis.

I have a friend with an s13 with a giant hole in the frame rail, but we slide that car all day.