I used this tail gear:

http://www.greathobbies.com/scart/pr...Number=CBA5516

... except I put a small bend in the leaf springs.

It sticks out about an inch behind the rear of the fuse, just under the elevator.

It is (will be) driven using a second push rod from the rudder servo. No direct link to the
rudder. Pull-pull cables to the servo would work well also.