I had about a day to get the alerions done before I plan to take a few weeks off to take care of our new Goldendoodle puppy Oro. The alerions went together really easily, though "sliding" that weight in and out wasn't as easy as I thought it would be. It took some muscle, some twisting, and the lovely sound of vibrating metal (think of playing an old handsaw with a fiddle bow string and you get the idea). In any case, they are done and flaps are next. The instructions for the alerions (and the flaps) say to dimple the part that goes up against the wing, but it doesn't call out countersunk rivets. After asking the factory and several other people who've built the plane, the answer I get is "Well, there might be a clearance issue, so some people have dimpled them and some don't." So, I dimpled the flaps and made the alerions with regular domed rivets. Fingers crossed that it works out!