I have thought about building an AL angle LSA. I have a concern about two rivet joints acting like a pair of scissors. resulting in the shear failure of one of the rivets. I had thought to stop that by using AN bolts of the same dia. as the rivets, washers and castelated nuts, saftied with cotter keys. The AN bolt is 3 times as strong as the rivet of the same diameter, and a lot more chafe resistant.