Completed assembly of center section skeleton today. Nothing really unique about it, but there are a few things that I'll point out for future reference, or in case someone else reads this log in the future.
1. There is a note on the drawing that shows drilling out a 5/8 hole fwd and below the big lightening hole for pitot lines or whatever. I see lots of build logs where guys have drills this hole in all the F716 ribs, but if you look at the print the two center ribs don't get this hole. I debated drilling it anyway since it seems like lots of people do and more access paths are better, but ultimately decided against it. Those ribs already have a pretty big relief in the fwd flange in that general area and it seemed like that's taking away quite a bit of meat in a small space.
I did however