I assume that the pushrod on the plans is made of wood? I suppose that would work but I would rather use the Dave Brown fiberglass pushrods. They are stiffer and stronger than wood. If you wanted you could even make them with 4/40 wire ends and be certain that they are strong enough.

Another option would be to build two elevator servos into the aft end of the fuselage and drive each elevator half with a short 4/40 pushrod. The servos in the tail might even help to balance it with the 1.20 engine on the nose.