Dimple countersunk all #40 holes in the front and both left and right seat floor. I did the same on both footwells. Dimple C.S. all stiffners and back riveted floor stiffners to left and right floors. Riveted rear seatback hinge and associated stiffner into place. Installed all remaining platenuts on left and right floors for the aft cabin covers. riveted stiffner and floor support angle with the front seatback hinge to the front floor. Riveted L & R foot wells and attached them to the front floor.
