Spent pretty much all day with finish work on the center section. Match drilled the F-715 ribs, match drilled the seat and baggage floor pans. Deburred and dressed the edges on everything, dimpled for the F-715 ribs, installed required nut plates on F-715's. Resisted the temptation rivets the F-715's to the assy. The instructions don't really say when to do this, but I think that it might be nice to have the option to yank these back out for deburring or whatever after match drilling the side skins. FYI- I've seen lots of build logs where people overlap the aft baggage floor to the aft seat floor in the wrong order. It looks logical to install the F-747 baggage floor, then overlap it with the F-742. This is backward and if you do it this way, you can't get the baggage floor back out without also removing the F-742. In the pix below, I've included a detail view which as far as I can tell is the only place it specifies this.