Final drill lower aft fuselage. There aren't as many rivets as on the wings, but this requires more attention to detail. Plus you're on your back for portions of it. I expect I'll be pretty sore after holding the cleco pliers and drill over my head for 2 hours.
Fnally got it all drilled, then took it all apart. Started deburring. Got the 778 bottom skin done and started on the 773 skins.