Nick, you'll have to let me know if it fits a BN6 (and an AC6, and a fretted AC6). It looks like it will, but it would be nice to know for sure, and it would be very nice to show up to something with a fretted AC6 on one side of the gig bag, and a fretless on the other.
http://www.monocase.com/mono-dual-bass.asp
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I'm not sure about the double bag, but I have a single and my VF5 fits great...granted that's not teh bass you have but still.