Riveted the stiffeners to the skins. Simple and lovely back rivet process. The brackets were drilled for the an3-4 bolts that will attach them to the spar. The skins were also bent in the break I made for the elevators way back during the emmpenage. Used the same I think it was an 1/8” dowel to get the correct bend radius. This worked out great and had it without pillowing.