Little help here Big John.
How do you eat a elephant?
One bite at a time.
Project cars are tough. I always advise to try to do something every day, even if it just something small.
I agree with the point
@70bigblockdodge is making. There is so much stuff on that car that you can do yourself... A cheap MIG welder and some practice... A cheap spray gun will paint almost as good as an expensive one and it will look great in the trunk and under the hood. It's not that hard. You've done the hard work.
Last summer, I had to do a lot of paintwork on some interior panels for my Barracuda. I painted a couple cars years ago, but all the materials are different now. I haven't done anything that had to look nice in a long time. I decided I could prep and paint the panels myself. I used spray cans to prime it and a cheap Harbor Freight spray gun to spray it. It took me a couple times, but I got it so it looks as good as any professional job.
The point I'm trying to make is that you can do whatever you set your mind to do.
I think that going forward with what you have makes more sense than buying another body and using it in your project. It isn't like you can buy an Imperial "body in white", so any body you buy is going to have its own set of issues.
If you really want to buy a body, think about just buying another, better condition (read no rust) complete car... Or maybe one that had already given up its drivetrain and using your restored parts to make it whole. Don't tear it apart, just fix what you need to, followed by fix what you want to. Use the parts that you've restored, sell what you take off or don't need and go have some fun.