Tonight I put a couple hours into finishing up he stiffeners. I was hesitant to bend the skins out of the way to back rivet the last rivet in the stiffeners, but in the end all of the rivets turned out perfect!  

 
Here you can see the rivets set in the stiffener. All measured with the rivet guage and set good.  

 
Here’s both elevators riveted with the skin stiffeners. Next step is to bend the trailing edges, and then move on to the skeleton.