I'm sure we're all saying the same thing here but in the interest of not leading a newbie astray, you will have thick and and thin spots in thickness along the lenght of the bow particularly if you have up and down travel (back to belly) in the grain. These "whoop-d-dos" are generally stiffer, and thus finish thinner in the areas which are in effect reflexed, and weaker thus consequently thicker in the areas that are deflexed. It's not uncommon for and up and down run to have the belly side filled with another ring. But ultimately this all get's worked oot during tillering, you just need to rough shape down enough to facilitate the intitial bending then let the wood guide you from there. You don't want stiff or flat spots when you are done, just like a straight limbed bow, so naturally some parts will bend more than others on a whoop-d-do bow.