Alaskan,
I would highly recommend going to
http://www.boatdesign.net/forums/sailboats/ and asking there, include pictures, and a rough idea of what you are planning on doing. While this forum is great, boatdesign.net has a pretty high concentration of designers that are happy to help actually do load calculations. Pay particular attention to Par.
Without comment on them, you might also want to look into composite chainplates. They eliminate holes in the deck compleatly, which in my eyes is always a good thing.