Wow, this is pretty disappointing, that this has been known about since at least 2010, was written about by Justin Twilbeck
on his blog in 2012, and still not fixed in the plans today.
About a week ago, we finished riveting the bottom fuse skins on. While I was searching for something completely different online, I came across Justin's blog post, and had a sinking feeling a monster had crept up on me while I wasn't looking. I turned and looked over my shoulder, and right there, not five feet away, F-1015A was happily waving its joggled flange at me, from OUTSIDE the 1004D channel.
After collecting myself, I read further into Justin's blog post, and discovered his notes on dimpling the holes in 1015A, that are also not included in the plans.
After that, I did a search here at VAF on 1015A and came up with this thread.
I really wish I didn't feel like I have to google each and every part number and plans page for a "gotcha" before proceeding.
My brief post on my builder's blog: https://www.brunbergs.net/2020/12/22/beware-page-26-5/