Oh joy, more rivets to drill. At least I can see these ones. Just spent the last 3 hrs chiseling out the roadside edges. For some unknown reason, there is a double outer skin with the outer one covering the bucked rivets. Doesn't look like a repair, looks like it came from the factory like this. Maybe they goofed up in assembly and had to fix it there.
Although it seem like I know what I'm doing, I'm just standing on the shoulders of giants who have done this before and kindly posted their journey.