Frame 5 will be located at the rear (aft to those salty seafolk) of the centerboard case. I glued the seat supports, then followed up with cutting the last stringer slots. The seat supports are on the opposite side of the frame than whats shown. Other than the transom, Frame #5 was the simplest to build. Not that the others were any challange. This one just seemed simple where it needed no holes or considerations.