Watching you with all this rust removal is bringing back painful memories! Here was my trunk floor two years ago. I spent a couple of months cleaning it all up and welding in the new pans.
I hate rust!!! I hate the way it looks, feels, and even tastes! And it made a real mess of my garage, the "dust" got everywhere and coated everything.
Keep it up, you are doing a really great job with it. Probably will be less remaining than at the factory before priming and painting 43 years ago!
Walt