I cannot speak as to getting BB in solid stock. I've been told that true BB can only be harvested in winter, when the ground is frozen. I was told that last winter it didn't freeze well enough for the lumberjacks to get full access to the trees as the basis for BB plywood skyrocketing (A 5'x5' of 3/4 stock was $70 here in Alaska). I have seen that it's back down this year.
I've used BB plywood for the drawer bases with maple drawer sides in a tool cabinet I've build and, with clear polyurethane over them, they aren't identical but look good together. An alternative would be to use a darker, contrasting wood.
As for a roundover, I'm a big fan of them whenever I'm working on solid stock. Even if I don't want a rounded over look, I'll use a 1/16" radius to break the sharp edge. It reduces splinters and makes the edge less prone to damage. Larger diameters give the wood a "softer" appearance, IMO..
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