I was playing with a 60 grit flap disc to see how well it works. First thing I find is more holes that are filled with Bondo. The metal is really thin here and will require some patch pieces cut for sure. I really can’t wait to start hitting this car panel by panel and welding this stuff up. 
I was advised by Eastwood to use 80 grit flap discs for paint removal to avoid excess heat build-up in the metal.