Turned the center section upside down to rivet the F-715 ribs to the skin. Used the gun with mushroom set and bucking bar and all rivets went well. Inserted and torqued the bolt through the rib and bulkhead. Then I used the gun with offset rivet set and bucking bar to set the two rivets through the bulkhead and rib. Forward edge is left cleco'd as this will be riveted with the side skin.
Used the squeezer to rivet the platenuts on the forward seat floor.
Used my original mark for the aft end of the longeron to layout the cut and the notch. Tried a couple of techniques to do the marking for the notch - measurements from plans and the F-714 as a template.