F21-01 Fuselage Tail Cone Box.
I turned the Box over so the top was up. On Upper Cross Ties #2 thru #4 I drilled the #40 pilot holes I was not able to get to when the top was next to the table. I also drilled the #40 pilot holes through the longerons and the top of Upper Cross Ties #2 thru #4. Next I up Drilled to #30 the holes through the longerons and the tops of Upper Cross Ties #2 thru #4. Also on Upper Cross Ties #2 thru #4 I up Drilled to #30 the 5 holes in each corner (total 30) that will be riveted. There are seven holes in each corner that are left at #40 for now. That is where the turtle deck formers will be attached later.
Where the Shear Web assembly attaches to the longerons I up drilled to #30 the holes. I also up drilled to #30 where the bulkhead gets riveted to the side skins. Next I removed the sher web / bulkhead assembly to see if I can put it back in as a completed assembly. It came out OK. Tomorrow I will try putting it back prior to actually riveting it together.
Click on a picture to enlarge it: