would have been easier for you to swap firewalls being your 77 is that bad. Save yourself a lot of work and have not have a pieced together car. Doesn't make sense to cut apart to car to that extent and then put back together.
It's not pieced together. I separated it at the sail panel, rockers, and back seat floor seam. It's all aligned and spot welded back in per factory locations. Matter of fact I used more spot welds so it's even stronger than factory not that it matters.
You see the rear frame rails go from under the rear seat all the way to the tail panel. They only Repro the back section to the tail panel. I didn't want to cut frame rails and piece them in. I wanted one whole section like factory and for piece of mind. I know professionals would say that their welds are just as good. I'm no professional so this was my solution and it looks awesome. Awesome because you can not see where I repaired the car. It blends in perfectly.
I have all factory 1977 metal in the car and not the Chinese aftermarket which was important to me.
I also utilized the door glass, some interior trim, screws and bolts to replace rusted ones, and so forth.
You can't beat having a straight car for a donor.
Hindsight, I wish I would of thought about finding a firebird, not that one was available at the time.