Hi,
I've never done a 3rd gen, but I replaced all the doors and the truck bed on a 2nd gen. Then I had a friend cut out the rocker rust and weld in new replacement panels. I also did replacement front fenders.
I was lucky enough to find a person originally from Wisconsin who lived in Alabama. He would bring up loads of rust free parts and sell them for very reasonable prices. That's the only thing that made it somewhat economical. Replacing the doors and fenders was a challenging project for me. Don't know if that helps?
Looking online at salvage part prices for doors and panels is sometimes scary!