EAA - Metal Fab and riveting classes
I don't own an AS yet, but have been spending a lot of time here looking things over and thought I'd offer this. A few years ago I was considering building an AL airplane kit. I joined the Experimental Aircraft Assoc. they offer seminars on many topics related to building and maintaining an airplane. I took their sheet metal fabrication class. In it you build a section of an airfoil with an assortment of riveting methods. If you will be riveting your AS this is absolutely worth doing if there is a class in your area.