OK thanks, I have to say, the more I look at the servos on the outside of the tail the more I have to agree - they do look rubbish! ;-(

...I'm going to try and redo them so that the servos are internal, but just the horns and rods external. (ie like a typical aileron link)

To do this I'm going to have to try Mick's rudder servo suggestion as if the rudder uses a torque rod then the rod runs right through where I'd want to put an elevator servo.

And I think the general concesus seems to be that I'd do best to get a new pipe. Wren has been mentioned, are there any other companies that people can recommend for pipes?