Derek,
The Orion hull came with a hand drawn single sheet details sketch, which showed the basic side/top views, and the rudder shape, and some of the interior cargo hold items. I had never even seen a narrow boat before I started this project. The internet, and YouTube proved invaluable in giving me the detail pic's I needed. My rudder shape is close to the one on the sketch, it might be slightly larger, but close to it. I used a single piece of "LEXAN" polycarbonate, with the rudder shaft hole drilled through it, than gave it a slight airfoil shape. I posted a short build log on rc groups; I'm having trouble posting the link, but if you search "ENGLISH NARROW BOAT BASED ON ORION MOULDINGS HULL", you should be able to find it. After finishing this project, I have a very strong desire to take a holiday on a narrow boat
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Mark