I wonder how people feel about very short rudder tubes that terminate below the water level.
I know it can be done and I had one way back when, but not now. I feel it is too risky. Too much chance for a leak problem. I am surpised to see that this is the current recommended way to build an EC12 for everyone including beginners building their first boat.
I generally put a long tube and rudder shaft on there and make my long "tiller arm" Z shaped to make the ends level with the servo and the rudder arm.
Scott