So, why is a CLer teaching FF building? Out club has probably put up a thousand kids on our CL trainers with no result (other than good PR.) CL flight training was just another "fun" thing to do. Entertaining, but not educating. And to build a CL trainer you get involved in extensive cutting of balsa sheet, painting (VOCs are an absolute NO! in today's school environment), and the expense of IC or electric power. Each of these is pretty much a show-stopper. Whereas these FF, even the Bostonians, can be built from balsa stick chopped to length, glued with aliphatic glue, and covered with tissue using a glue-stick. Cheap, safe, easy to do, but also skill teaching - tight joints are critical, attention to detail is demanded, and in building the No-Cals the kids have to learn how to laminate.
So, FF building is the entry point. (This will be a "duh!" to the guys that came into CL via FF or in addition to FF.)
Scott