The shoulder-support is made as pr. plans except for the seatbelt-hardpoints. After advices from other builders I expanded the spacing between the hardpoints to 11″. Doing this I avoid making notches in the head-rests and I also avoid to have the seat-belts lying into my neck. With my belts it’s no danger that I will slip out of them in a crash. In this picture I have epoxyed the plywood.
I made the glass-fills that goes ontop of the plywood as per plans. Wetted out three plies of BID 5″ x 5″ and cut them up in smaller 1.25″ x 1.25″ pieces. Using saran-wrap ontop and under this is no problem.
The nut-plates are riveted to pieces of thin aluminum. I alodined the aluminum and drilled some extra holes in the plates to make the flox grip better to the plates. I will flox these to the underside of the plywood before I flox the shoulder-brace to the seat-back later.