I had to trim the forward nose of the vertical stabilizer above the top skin, about 1/4" to get enough clearance on the top skin. Clamped the gussets to the longerons and clecoed on the canopy recess rail. Clecoed the top skin into place Straightened the rear seat harness brackets. Modified as listed on the drawings to remove some of the bracket to lay flush when attaching to top skin and bulkhead.