Update: I've got one more bottom floor brace to install and I am sending the car to get media blasted.

In talking with the guy who is going to do the work, he quoted me to media blast the body shell on the rotisserie, and he is going to clean and seal with PPG DP90 Epoxy primer when done.

I have decided to put the seat pans in after it comes back to keep media being trapped although I could do it either way.