Here is http://www.garagehandplanes.com.au/collections/riva-series revised Riva board I modeled, David had a bad experience with another modeler (solidworks amateur). In way over his head generating a complex surface model. 
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Nice! Have you guys built it? I can see how one of these would work looking at the model. Never took them seriously before or used one. A bit bigger and it would make a nice kneeboard.