Check out the DN-class ice boats. DN stands for the Detroit News, the newspaper that commissioned the design back in the '30s. It was intended to be home built.
And while you can get all hot, heavy and hi-tech with a DN, you can also just build it the way they did back then.
Plan (and, I believe, irons) are available from the class association. Google for "DN class ice boat" should probably do it. Zot me an email if you can't find the class assoction and I can probably dig them up.
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