I've been repairing messed up sheetmetal in the center floorpan. By the looks of it holes were drilled for three sets of bucket seats. Some of the holes were ripped. I just cut the junk out and fabbed up some patches.
The last two photos show an area that was hacked up to make room for fenderwell headers. They removed part of the support structure and never did anything to reinforce the area. That's what I did. I boxed it in, so it will still provide clearance but still be strong.