I took a whole sequence of photos showing how I added a skeg to my Ulua and mocked up and built a rudder but I had forgotten to put the memory card in the camera so no photos of that. Here is the mocked up rudder and the final install. It's glued on with 5-min epoxy so I can remove it easily if it doesn't work. If you look carefully you can see a piece a monofilament which will run on the outside up to two small holes in the hull sides and then to a control bar at the stern seat. The photo sequence shows the rudder operating. I used the attachment method that James Wharram uses on his boats, a figure 8 lash, that keeps the rudder aligned with the skeg. It's tied on with monofilament which I tightened a fair amount so that the rudder naturally returns to a middle position. The next task is to flip the boat and install the control bar then a water test.