Drew the centerline on all the longerons @ 5/16" from the edge. I ripped off an idea I saw on somebodies build log on VAF and made an edge marking tool with a sharpie and a couple of popsicle sticks. Worked great!

Because this is a cone shape, the bulkhead flanges don't make a 90* angle to the bulkhead face except where the fuselage is flat on the bottom. Because of this, I didn't try to flute them or even straighten them up much before doing a trial fit. This meant that there was a lot of off and on, but ultimately they fit well.

I also reworked the F-779 skin again in an attempt to get the F-711 & 712 fitting better. I gave up on trying to massage it and broke out the fixture I used to roll the rudder & aileron leading edges. This worked pretty well, but the edges are still sprung out a little. I think that is about as good as it's going to get.

The tail spring weldment isn't sitting 100% flat against the F-712 bulkhead. It's pretty common to have to shim this area, but it's flush in the middle & also on both sides once you get about 1/2" down from the top. The instructions say to shim it if you have a gap, but they are pretty vague, so I don't know how much gap is too much here. It will all draw down when drilled for the vertical stab bolts, but I don't want to end up with some kind of weird skin buckle here, so I may revisit a shim on both sides.

Checked for fuselage twist with plumb bobs. The instructions say to use one at each end of the fuselage, but I had 4 so I strung them all up. Was gratified to see that the fuselage was pretty much dead on right off the bat. I leveled it by shimming one side of teh fwd sawhorse, then had to twist the back end about 1/16" to get it trued up. Not much at all.

That seemed like a good stopping point for today, so I'll drill the j channels next time.