I flipped the center section over so I could start working on the bottom skin. This was a real exercise of persistence. I put clecos in the front bulkheads and then at the baggage bulkhead, only to realize that the holes in the seat ribs between them were way off (by about a 1/2 of a hole). It looked like the distance between the bulkheads grew by 1/16" between when I match drilled and when I riveted the ribs in. I pulled the front bulkhead clecos out to see if I could massage things together - in the picture you can see the forward edge where the skin and the bulkhead flange should be even. It doesn't look like a lot, but a half of a hole might as well be a mile.
It took the better part of an hour of trial and error, but I finally found a pattern of clecoing things together that allowed me to gently pull everything in line and even. I suppose it's a good thing that the skins are so tight, but boy does it make it tough to get them pulled together with the parts.
The baggage bulkhead was originally a full hole out of alignment, so I decided to rivet that line first. I was able to do everything except the very middle rivets. I can reach those, but controlling the rivet gun is easier said than done when you can't put proper pressure on it. I'll probably enlist Rose to help when I get to the middle.
After the baggage bulkhead line was done I moved to the seat ribs. It is very slow going simply because it's kind of an awkward position. I got two ribs done and then called it a day.
