located holes in aft upper cowl for sky bolts per intersecting straight line method. Got clecos in every other hole, then stepped them up to full size incrementally, checking often with a mirror and flashlight to attempt to keep them centered in the sky bolt flange openings.

The skybolt receptacles are free to slide back and forth maybe a 16th" so you have a little wiggle room if they aren't perfectly centered. I did have one that was going to be a little iffy along the longitudinal axis so I used a floating skybolt at that location which allows the same movement along that axis.

Many iterations of off/on/off with the upper cowl to get to this point, but everything fits quite nicely.

Two things that have helped with this whole process; The rental fixture from FlyBoys that gives you lots of places to drill/cleco too at the nose bowl and my self leveling laser.

I splurged on the laser when I was truing up the fuselage and have found several other uses for it as well. In one of the pictures below, you can see how I'm using it to make sure that cowl is dead nuts level.

Note the horizontal beam intersects the cowl cheeks at the same place on both sides, and the vertical beam hits the end of the prop fixture right on the centerline, as well as hitting the canopy latch post in the center of the roll bar. In between it hits the cleco thats engaged in the center sky bolt location. Thats about as perfect as I can make it.