I just finished putting a pull-pull rudder in a H9 33% Cap. I would suggest you keep it simple, avoid tiller arms (lower cost, lower weight, direct connection means less slop). Find a single ball bearing servo with enough torque and speed to do the job. For a 33% plane, the Hitec 5735 will do fine. I used an Airwild 3.0 inch aluminum servo arm amd Rocket City horns on the rudder, Sullivan 4-40 eyelets, 60lb plastic coated fishing leader for cable, and metal crimps made for the fishing leader. The cables run straight. The most important thing is the geometry needed to prevent the cables from tightening up as you move the rudder. Do a google search on the words "ackerman and pull-pull". This will explain correct geometry.