Sorry, I'm not enough of an expert to answer your question, but one thing I remember is that in the movie "The 13th Warrior" there is a scene of a duel where there are a number of round shields used, and they can be seen fairly well. You might get some ideas from that. If you have a DVD player, you can rent the DVD and pause it at those scenes, zoom in, and study them more closely. I remember them as being very neat. Good luck!
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