I primarily use 8" draw knives with curved blades and I only buy the old timey ones. As far as the lay out goes, a little more info would be helpful. Such as style of bow, draw length, intended draw weight and some good pics from both ends, side profile and any character bits like knots and stuff. The more we know about your goal, the easier it will be to help you get there. Also, is this stave dry, green or somewhere in between. If you just split it, I'm guessing it's still green. If that be the case, you can rough it out but not tiller it. Walnut is slow drying stuff and if you try to tiller it to early it will chrysal horribly. Every bit of info helps us help you. Josh