IMO walnut is a "borderline" self bow/belly wood,and i wouldnt classify it as a "true" bow wood....my favorite use for it is in cores in a tri lam,or overlays n underlays etc...sure it can work sometimes,but if there's much better stuff available then why? And in my case I have a bazillion others at my disposal better than walnut...if its the best ya got available then I suppose go for it. Its pretty wood,but kinda soft and weak for what we need