I'm guessing you could buy them a whole lot easier and maybe cheaper than making them. I'd check say, www.infisherman.com or some of the "walleye" sites if you are dead set on finding plans to make them.
My ex F-I-L used to build them to troll for salmon and lake trout on the Great Lakes. He called them Finn skis. They apparently worked well, but seemed like more trouble then nessary to me. I wish I be more help and could tell you where he got his plans from.
I got a set I made and used on Gitshegummie. The bought foam ones may work a bit better as they may get you wider from the boat faster, but my wood ones did the trick. They are easy to build and then its just a matter of exactly where you place your line to the board.
Mine are 1x8s with threaded rod between. Then an eye bolt to attach your line. You could up grade with useing cedar (Lighter wieght) and maybe aluminum shaft. But cost is low, not including alcohol to keep your blood pressure down while tuneing them!
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