I now that you are all waiting anxiously to see how that walnut back gets put together. Well, so you can sleep at night again, here is the result. Both the luthier and the customer agreed that the ‘middle road’ on the sapwood was best. Not too wide and not too thin. I cut things down and glued the back up. I really like the result. There are little things like the bright edge in the sapwood just before it hits the heartwood that makes things really interesting. I think that doing various trial bookmatches ‘photographically’ was really valuable in this case, because I do not think I would have discovered this particular layout by just overlapping the wood and trying to imagine things.
All glued up: