I attended an RV Builders class at Arlington, WA. It was a two-day course. It was the basic builder’s class. It covered doing the aluminum sheet metal work. We built the two practice parts that Van's sell. One is riveting together three pieces of sheet. The second is a piece of an aileron. I had already done both of these projects on my own and so the class was pretty much a repeat of what I had already learned from reading Chapter's 3 and 5 and the Sheet Metal Book. It was fun to meet other builders. We had a 777 pilot from China and a 737 pilot from Las Vegas. I guy from France, some others from Oregon, and a couple local guys like me. I would say if you can read the manual and build the practice parts yourself, then skip this class and save the money for something more advanced. But if you need someone to point out the important aspects of building a sheet metal airplane, and if you want to test your abilities before buying a kit then this is a great class for you.