Depending on the placement of the C of G perhaps place the rudder servo at the rear fuz bottom and use 2 carbonfiber push rods, one for each side, instead of pull-pull but still pull-pull hook up design. This assumes one could get the a/c into balance with an additional rear mounted servo without having to add weight for C of G purposes or it will be pointless.
I like the idea of using two horns instead of the heavy steel bolt. Lets see what horns and solution to possibly reinforce the structure I will come up with whenever I get to that stage.