Tom,
Jack's SC is an interesting stunter, with an interesting history. In Jacks' mag article, he mentioned recognizing a small Comet rubber FF 'scale' kit as of a plane he had tried to ID, earlier. The plane was used to represent Japanese dive bombers in a WW2 'buy Victory Bonds' movie epic.
The movie was 'Wake Island' (Paramount 1942) - was on a movie channel within the past week. It did have Ryan SCs attacking Brian Donlevy and the other good guys.
The Ryan SCs were mostly round engine powered, although at least one had an inverted in-line (Ranger? Menasco? My reference book is in the other room.) The SCs also had aluminum monocoque fuselage structure, well rounded all the way back. The Comet kit had the simplified triangular rear deck. Jack referred to the Comet kit, so the stunter does, too. Jack also used the box art color scheme - which looks right!
It occasionally crosses my mind that it would be interesting to see if Jack's basic SC - with a rear fuselage more "scale" than the little Comet FF kit - would still be generally accepted as a Classic. After all, it's just cosmetic "kit or plan bashing."