You are right that in general layout with the shoulder wing, etc, it does look a lot like the flattop stormer. The tail section reminds me of the mustang. I am kind of thinking that the P51 Mustang, because of its fame in WW2, probably influenced a whole generation of models (and homebuilts) after the war, and Carl Goldberg was a reputed to be a very good businessman and knew how to market kits.