Tracker,see if you can find a nice straight hickory,eastern hophornbeam,elm,white oak,or even red oak ,( and there are many more usable species in our area).If you'll wait just a few more weeks,when the sap has risen,the bark of these whitewood species is easy to remove.Then the wood right under the bark is the back of your bow. You can lay out your bow ,and get it to near final dimensions,then clamp it in reflex,and allow it to dry on the form,then in about a month you can take it off the form and it will hold the nice even reflexed shape.store it in a nice dry place,like in the house,then in a couple of months ,it'll probably be ready to tiller. God Bless