I just got my grandfather's old El Camino that is mechanically fine but got T-boned a few years ago. I am planning on getting a patch panel and just replacing the quarter panel. I have never done anything like this before and was wondering if there's a better (hopefully less expensive) method. Here is a picture. Any help is appreciated. Thanks!
(Ignore the missing wheel, I'm putting in new shoes.)
https://imgur.com/a/I9nk3CO