I had a very productive day today, made very good progress on the center fuselage.
First I marked and cut the two center seat ribs. They need to have this opening, to allow the flight control assy to be installed.
With those done, I could start clecoing the center fuselage together.
After matchdrilling the bottom skin to the ribs, I lifted the assembly to the table.
The outboard ribs needs to curve to form the fuselage shape. I marked the fluting positions between the rivet holes.
I also had to cut about 1/5″ away from the forward edge, to make it fit into the F-704 bulkhead.
With the bottom flanges fluted and drilled to the bottom skin I marked the holes for the seat pans, so I could flute the upper flanges.
Last thing I did today, was to deburr and matchdrill the baggage area corner ribs to the bottom skin.