Updates! I can't remember which thread I mentioned it in but here is what happened with the base 2005 parts car I got. It was rust free in the areas I needed. It had roughly 250k miles with a bad trans. Some parts went to another SS I have and here is what is going on this car.
For awhile the rear of the trunk floor has not been perfect. I POR 15'd it a couple years ago. What happened was a previous owner spilt a bag of what looked to be softer salt in the rear and it trickled down to the rear part of the floor. It sat like that for years and eventllly make the metal soft. Now its not totally rotted out but its not up to the standards i'd like it to be for this car.
Here is the car being prepped to get cut up
Now I cut way more than I needed but I would rather have too much than not enough
It did have some surface rust so I sand blasted it
Then hit it with some primer
Now I'm not positive when I will actually dig into this but we will see.