I started today with back riveting the stiffeners to the rudder skins.  This worked extremely well.  I had Tami come out and back rivet a couple of rivets so that she had an idea of how to do this.

In my opinion, back riveting produces the nice flush rivets of any method I have tried to far.  As you can see below, they sit really nice and flush with no deformation of the skin around the rivet that is seen with bucking and squeezing rivets.  I just wish all methods produced results this good.

Below, you can see the inside rudder skin for the left side.  The stiffeners are primed and I have left as much of the vinyl on as I can to prevent scratching the Al-Clad skin while working with it.

There were no surprises and this went smooth with NO CLOSE calls for wrecking more parts.  So far, so good.