I just traveled the road you are turning onto. You will have the hardest time with the rust along the bottom of the rear fenders. Nobody makes a replacement yet. Hope you find a good body guy to help. You can see what I did here.
http://hesproductions.com/59sub It has been fun. I'm working on drivetrain and interior now. I did not do a frame off as I needed the truck to drive asap. Mine didn't have quite as much rust as yours.
Take lots of pictures and post your questions here. These guys are great and as you can see are hard to stump.
