Finished fiberglass seat back top fitup. Iterative process of fit, trim, fit. Was getting interference when folding the rear seat back forward with the bulkhead. Sanded just a bit off the back shoulder of the fiberglass to remove the interference. Back flange still does not sit flush to bulkhead because I layed this out without fully seating the hinge pins, but I think I'll just put an arc of weather stripping or equivalent along the bulkhead. This will cushion and protect the bulkhead, and fill the small gap.
