Used construction paper lined up with the top and taped the edge to the outer skin. Burnished the rivet centers with a ballpeen hammer, hand drilled the construction paper, positioned the doubler, flipped down the construction paper and transfered the hole centers to the doubler.
Pilot drilled then open one hole, clecoed, another hole, etc.
Positioned the rudder perpendicular to the wing tips, and horizontal stabilizer and duct taped it in place.
Carfully removed rudder and drilled the rivet holes in the upper hinge angles.