Great pictures to bring back memories of the early years we did not know any better. How did I know an OK Cub 049A would make a Scientific American Boy nose heavy. It flew and flew until I wore it out. Second one was built adding flaps to the design and performed first loops, same engine. Was balanced a little better. Hope you find your plans. I discovered I still have a complete American Boy in the dungeun. Later, DOC Holliday