I just used flaperons, ailerons that lowered about 10degrees to act as flaps. The flying stab hinge line is too far aft as originally designed and had a tendency to wander at high speed, with analog servos. I don't have the dimensions I used but move it about halfway between shown on the plans and the leading edge, then with today's modern digital servos all concerns will go away.
Enjoy that hotrod, keep it light, shoot for under 11 lbs. as it has a small wing.
Jim