Cadillac,
One more thing. It looks like your stave is one inch thick and by your outline it looks like you are planning on narrow stiff handle. That means you are going to have to glue on another piece to make it thick enough. Glue on risers can be done, but they are notorious for popping off. I've had it happen to me more than once, and I only pulled it off successfully twice. I don't mess with them anymore if I'm using one inch thick wood.
I would make a bend in the handle bow, where the width of the handle matches the width of the limbs. These are quicker to make, involve less work, and are generally easier for a beginner to make. You can also get hunting weight bows from them. Mark off the center 4 inches of the bow outline and just leave it alone when tillering. But I would pick another board. Good luck.
Austin