Late reply. If the top right flap popped up it would act as a speed brake and cause that side to go down because in atmospheric flight, it would destroy lift. Most complex aircraft (and gliders) have speed brakes/ground spoilers. On my plane I can pull a handle and hydraulicly pop 2 boards per wing in the air symmetrically. On the ground upon landing, all four boards get popped and an additional 2 boards thus 6 boards total destroying all lift so the plane doesnt go bouncing down the runway when you are trying to land.
Back on topic....amazing build you have there. Very clean, I would have a problem painting it as there is something beautiful with the bare bones of a SS model.
