red oak wouldnt make a great backing, but black walnut would probably work. if it were me, id usea walnut backing on red oak for the first one, then move onto something like a walnut backed cherry, then maybe a tri lam in similar laminations. no reason you couldnt use the walnut for the back and belly over a cherry core either.cherry is light and good bow wood but weak in tension, so a thin walnut backing would help that. keep it simple at first, then once you got a few knocked out start experimenting with whatever bow style that you like the most.