I've been hunting and can't find any of these anywhere for bass. I've seen a couple on customs (Wendler Electrocoustics) and seen a couple on vintage, often hollow bodied basses but can't seem to locate any in production. I'd love to make them myself, but I have little experience and no tools.
Come to think of it, Ibanez has a couple on the Artcores... maybe I can yank one of them. Or just email Wendler. His stuff is cool, just not what I'm after. Too 60's / 70's Japanese in appearance.