Absolutely likeable stick of wood. I have done with worse!
+1 on the bendy with flipped tips. You can also make the bow with a grip area just barely bending, so the side view of the bow when bent is slightly eliptical instead of circular.
Those first yellow rings will do just fine. If you find that you have hit a full ring, but it is partially sapwood and partially heartwood, don't worry about it. Practice chasing rings in the sapwood and by the time yoou get to the heartwood, it will be a lead pipe cinch!