I believe the S6-B was just before the Spitfire, early 30's vintage...It was a Schnieder cup trophy racer, and a very hot machine for it's time! The full scale A/C had huge floats in comparison to the fuselage, so it might be a scale plane?
I don't recall seeing a kit of it, not in that size anyway, but somebody else might know...I'd say it's probably scratch built from plans.
The weight will help a lot in determining an appropriate engine...How much does it weigh?
It's a "racer" so it ain't gonna be much like a Cub!
so I would suggest some help, at first anyway...
Personally, I'd say if it's not too heavy, and it's built strong and straight, it oughta fly quite well, (maybe
Give us a little more info...