crgibson: If you made the bow narrower than the buildalong, then I'd made it a full 1/2" thick for the entire length of the bow (minus the fades, obviously). However, wooden bows don't follow a recipe, so this is only a starting point. A lot of factors come into play when actually nailing a target weight/draw length. Also, paper, rawhide, denim, linen, silk, etc. are all protective backings and will NOT raise the draw weight effectively. They simply help protect against a splinter raising on the back of the bow.
Hope this helps. Best of luck.
Regards