Here's the front of the rudder at the bottom. The hole is where the hinge rod will be screwed. On the right side you can see a couple of manufactured heads of rivets. I'm proud of those as the plans call for optional pop-rivets if you can't get a good structural rivet in there. With the help of my trusty tungsten bucking bar, no problem!
Here are some of the stiffeners that I got help riveting (see the video several posts back). The specs are dust that I'll blow off before sealing it up.