Took the rudder skins and back riveted the stiffeners to them. Made a small mistake and got about 3 or 4 cycles of the 2x gun with one of the rivets off the back rivet plate. A slight outward pillow in the skin. 63 rivets per skin for a total of 139 rivets down.

Rivet tape made this a whole lot easier.

Did the left skin 2nd.  Came out real nice.  Ice is broken with the 2x Sioux gun.