I have started this kit. I found the plans & instructions to be the same as the Dynaflite SE5a I am also building (Excellent). The wood is very good. The plans state they were drawn in 1996. However, I know the Butterfly to have been around since the early 1980s. I would guess the kit has been upgraded and re-deisgned since the original Craft Air Design of that time. I only have the fin and Rudder built so far.

Ballgunner, what did you do to strengthen the polyhedral joint?