Clecoed the front seat back together. Got out the pneumatic squeezer and began mashing rivets. After getting all the rivets squeezed, I started on the rear seat. Cut the hinge to 18”, marked and drilled the “locating” holes. Clecoed the hinge to the seat back and match drilled the seat back to the hinge. Bent the tabs on the upper seat frame to lie flat on the lower frame per the manual. Match reamed all the holes in the rear seat back to #30. The fun (deburring) begins tomorrow.