After starting mine before christmas and JUST now finishing it, ill give you my dimensions, which jawge gave me, but I cut .75 inch off both ends cause my draw weight was a little low. Anyways, take board, find middle, mark 2 inches on either side of middle, that's ur handle. Then on the tips, make about 5/8 inch wide. From there, draw a line on either side to you handle area, making a triangular style bow. Cut with jig saw to save time and strain. Then u can make begining thickness at the tips fading to the handle, and cut again with jig saw. I really hope you understand what I'm trying to paint here! Non bending handle design by the way..
Anyways, my bow ended up 40lbs at 27 full length, then cut off .75 inches of either end, brought the weight up to 43lbs at 27. Shoots pretty sweet to with the matched arrows I happened to have. Ill be making a post soon. I'm pretty proud of my first bow