Calfee's been building one for several years now. Still a novelty, but kinda cool.
I think the bike in the pic at the top of the page should go about 14lbs based on the carbon lugs on the frame.
Interesting though, Campy Record shifters and derailleurs, but a Dura-Ace 7800 crankset. That's straight blasphemy in the bike world.
http://www.calfeedesign.com/pages/images/NewBamboo.png