Here are some pics that show the finished stiffeners after smoothing all the edges on the Scotch Brite wheel. What an amazing tool for working with aluminum. Sometimes the chemical folks come up with the some really amazing things to benefit mankind. Dangerously jagged edges are all made as smooth as a babies bottom. The corners are rounded, and the parts are completed.
The idea here is that the 
stiffeners must conform to the tapered shape of the rudder. (Small at the tip or trailing edge, and much wider at the front. The rudder is actually a very complex shape that contains multiple tapers from top to bottom as well as in width from side to side. So the stiffeners must be very small at the trailing edge where they essentially come together with both sides of the skin, and they then widen out as the skin gets wider towards the front.
stiffeners must conform to the tapered shape of the rudder. (Small at the tip or trailing edge, and much wider at the front. The rudder is actually a very complex shape that contains multiple tapers from top to bottom as well as in width from side to side. So the stiffeners must be very small at the trailing edge where they essentially come together with both sides of the skin, and they then widen out as the skin gets wider towards the front.
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