Okay I am going to attempt to post some pictures that I have. Well I thought the seacast would have been easier but when I started to take the wood out I realized the wood was in much better shape then I thought and i calculated the seacast to cost at least 650 for 15 gallons plus whatever else needed.
here is a link to the pictures I'm not sure how to post them directly.
http://picasaweb.google.com/drjmoo1/BoatTransom
the rest of the boat is completely sanded and I am in the process of repairing the cracks and things but I didn't sand the transom area because I didn't know what to do with it yet.
One picture has red lines where I was thinking about sectioning in the new piece.
Thanks for all your ideas. let me know what you think of the pics.