I'm so glad you posted this. It made me go back and look at the bubble door installation instructions (which I had only briefly skimmed), and I found that it calls for using 3M 06382 Acrylic Plus attachment tape. That will cover virtually all of the excess holes, so I really only need to get a few on the back side and on the top and bottom of a couple tubes welded closed. Thank you!!
Yeah, I've wracked my brain and I can't think of another way to get a bolt and nut on there, so I'm going to try the rivets. I ordered a couple of different grip lengths, so I'll just use whatever seems to fit the best.