Have you inspected the bottom of the car? What do the pinch welds look like?

You could still see the original paint on my floors (no surface rust) and eat off them too. But the pinch welds were greatly expanded from rust.

Your floors at best were swimming in wet carpet. It will be a miracle if you can save the floor. Your front toe kicks are gone so what about the frame support? Right now your looking at least 4 panels. You need to sand blast the affected areas so see how much metal is left.

How about the rear quarters, door and fenders.

What's the trunk look like? Get that puppy up in the air so you can take some pics of the underneath.

See that pic of my car in my sig? That's the before pic! I have done a frame off restoration. Still working on the eventual after pics. lol