Next, I decided to tackle the centerboard. I found an excellent guide on building centerboards and rudders on the web here:
I tried my best to follow it closely. First I ripped strips of clear Alaskan yellow cedar.
Laminated them making sure to alternate the grain direction to prevent warping.
I don't have a thickness planer, but I use a device called a Wagner Safe-T-Planer that works very well. It fits into a drill press and it's kinda like a 2 3/4" wide router bit. Here is a youtube video showing how it works:
I mounted the planer in the Shopsmith and wheeled the Shopsmith over my workbench. I mounted the centerboard blank on wheels and rolled it around under the planer until it was flat. Then flipped it over to do the other side. After checking it with a micrometer I was amazed at how flat it turned out.