Installed and match drilled sidewall stiffeners, bulkheads & closeout panels. Also watched CNN quite a bit, as today was the election certification and the riot that ended up with people storming the capitol building.
Trimmed about 1/16" off the aft end of both F-722 stringers due to interference with the flange of the F-706 bulkhead. In retrospect, I don't know if I really needed to do this. Later when I clecoed the F-750 side panels on, it was a pretty tight fit so they may have they forced the flange of the F-706 aft a little bit anyway. Didn't hurt anything though, and made it easier to get them lined up with the holes in the skin.
If you look at the second picture, this little ear on the end that has about 1 ED, is on the fwd end of the F-722. It's prepunched that way from Vans. This seems to be a theme with them. There are lots of pieces that the stackup of mating causes one end or the other of a stringer or rib to have that little ear, and it almost always has edge distance issues. That's before match drilling, so you can see that after you open this up to #40, its got probably less than 1 ed. Not worried about it, because they are evidently supposed to be that way, but if you try to match drill it, there is enough wiggle in the tab that it's easy to blow out the hole.
My process for making sure that doesn't happen is to not match drill those tabs. Instead, I drill the mating structure final size then open this hole up separately. This prevents blowing out the hole, and the matched holes from vans are close enough its no problem to get it to match up afterward.
After a lot of trial fitting and sharpie marking to make sure I wasn't going to blow out anything, I went ahead and match drilled. No challenges, except where the upper bent flange on the F-724 gets attached to the main longeron with a -4 rivet. The print calls out a bare minimum 1/4" edge distance on the longeron, which doesn't leave much room for error. It also doesn't do a great job of leaving good edge distance on the underlying flange either.
On the left side, 1/4" left me with basically 1.5d ED on the underlying flange, so I measured the same on the other side to see where it fell on the longeron. Due to the way the flange was laying, I was able to fudge the hole outboard an extra 1/16" or so and maintain the same ED on the tab but pick up a little more breathing room on the longeron. I know that 1/4" is exactly 2d for a -4 rivet, but it still makes me a little queasy to drill a hole that close to the edge of something as important as a primary structural member. If anything at all goes wrong, you're screwed.
This job obviously didn't take 5 hours of hands on work. But I'm logging that due to pondering time, shop cleaning time, sitting and watching the TV in disbelief, etc.
Other that waiting for the replacement forward floor stiffener to show up, I'm pretty much done with all the assy and fab work for this stage. Will spend tomorrow reviewing and taking care of a few small tasks, then the day after, I'm road tripping Holly back to college at University of Arizona. 15 hours or so our house in Scottsdale where we'll meet Kriya and spend a few days before Holly heads down to Tucson.