The aileron differential on my 150 is about 2 to 1. I planned to provide some differential by the use of a cable driven bellcrank in the wing (again, like the 150, 172, etc.).On the SSSC the ailerons are hinged by piano hinges on the top surface . More up than down, ( don't remember the amount without digging through the plans). Has 28' of span with a 48" cord , 24" wide fuselage. Each aileron is 7' long by 12" cord. You can bank the wings up to 20 degrees with your feet on the floor and the ball will stay centered. Over that you need just a little rudder. Ailerons are light and responsive. Same for the elevator and rudder. Everyone that has flown it, loves it.
I watched a video of your SSSC, and it looks very nice. Looks fun to fly too. Does the differential control the adverse yaw over the full speed range? Also, does the leading edge hang down into the airstream when the aileron goes up?