Hmmm... I'm certainly not in a position to say whether they've ever built one, but I think I can give you a few things to think about.
The only things that would really be different in terms of construction would be the width of the grooves in the nut and the bridge saddles, to accomodate the larger strings.
Sure, the neck setup might need tweaking, but that's more dependent on the brand and gauges of the strings you choose to use - assuming same brand and range of gauges, the EAD are going to be the same tension whether you string it BEAD or EADG, right?
I suspect the biggest issue is whether you could actually find a string to use for the B, that wouldn't be incredibly floppy. My guess is you probably won't find one short enough to have just the nice tapered bit wrapped around the tuning post, but even if you're willing to live with that I suspect you won't be able to get playable tension with anything being sold today.
(Others should jump in here if I'm mistaken, of course.)
If you haven't already done so, you might want to use the Search function to look for previous discussions on either short or medium scale instruments and strings - I think there was some talk about this a while back for mediums, at least.
