Good job on the tutorial here, John. Dang nice bows too.
I make my shelves like you do, but glue the pieces together and then hold them in my hand and shape them on my drum sander. A little risky perhaps but works well... and no risk of nicking the finish of the bow.
Jeremy, p.m. me your postal address and I'll send you some thick stout leather... enough for a handful of shelves.