Wow, now that's some rust! I've done a little body work, but my buddy Chuck is the body master he took a 06' civic R or something like that and it was wrecked in the rear dr side quarter panel, and cut that stuff out and fit 2 cars together on a frame machine and it looks great. He's on my FB page as Charles, looks like Vin Diesel. His cover photo is that car., he's my go to guy for bodywork.
Jeff