Heres a picture of the centreboards I made probably 12 years ago, I used the step method with a router and finished by hand, covered in glass.

I also made cedar rudders with the fibreglass rod push down arrangement, but I broke one when I fell on it during a capsize, I made another to replace it and then got Boyer kickdowns, out in the shed somewhere, can't find them, like a lot of stuff out there. <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" />

The centreboards use cedar, oregon and I think huon pine, just boatbuilding scraps from a boatbuilder. Strong as.

Regards