OK... what you are calling a gap is a designed in bevel allowing the movement... its not a problem. (but the description sure sounded like a problem...)

That plane (just from the tailplane shown.. I can tell) is not a fast aircraft. the drag and turbulence of the bevel is not going to be a significant factor in the control system.

Thats one of the Kyosho appx 40 inch span electric Cessnas?