When I got home from work I was pleased to find the left elevator control horn was sitting at the door.
Got it riveted in place and closed out the skins. Just need to roll the leading edge.
7/23: rolled leading edge before work. I was anxious about it, but it actually came out really well. Minor pillowing, but very consistent along the length. If not my best LE roll, it was definitely the easiest. I used clear packing tape instead of the gorilla tape I had been using. The gorilla tape is so hard to remove from the skins that you end up distorting the roll a bit. Much easier and more consistent results with packing tape. Will use this method going forward.