After setting up the tailcone on saw horses the same height as my work bench.... I loosened the side skins and fit the longerons in place. Next, the center section was place in position on the longerons and slide backwards to aline with the bottom skin of the tailcone and also the F-706 bulkhead. Definetly took a bit of "Coaxing" and height adjustment to get the proper alinement of all the rivet holes.
