Completed back riveting the skins and through 7-7. While I do have a backrivet set, I've found that I get a nicer shop head with a polished 1" flush set; it allows better centering in tight spots, such as against the stringers. And once you get practiced at back riveting, the back rivet shroud is just annoyance anyway. I also created a 6" tall fixed rudder trim tab from 0.032". It extends 2" beyond the rudder and is positioned to be above any draft from the Horizontal Stabilizer, yet low as possible to provide the tab the longest moment arm (smaller adjustments have a bigger effect). I will bend it to be neutral to the rudder chord line until flying the airplane and adjust left from there [keep in mind that trim tabs move the opposite of what you want the control to do]. I did consider the spring loaded adjust from Aerosport, however once trim is set for flat footed cruise, it's rarely adjusted unless something physically changes in the airplane, which is unlikely and would only result in another ground adjustment of the fixed trim tab. The Aerosport rudder trim kit is nice and would likely be very nice for adjustments during climb and descent as well - however, I have a yaw servo to handle that task and just wanted to have a trim tab do the reference trim setting in cruise. Other thoughts are that rather than stick a wedge trim tab onto the rudder after completion, I wanted to have a flush riveted tab, which can only be done nicely during construction. And I can always cut it down later if needed.