The tub was placed right side up to install the front and back seat tapes. These are layed up on foil as shown in the pictures and placed into position. About 30 minutes later I remove the foil and treat any air pockets. This works very well for getting the tapes into the correct positions.
The edges are then peel plyed with half inch dacron to give a smooth transition.
The third pic shows F28 in position and something that looks like a fuselage for the first time. Its weight would be around 20lbs and its not yet rigid.
