I'm afraid to even ask, because of how many possible carbon limb questions this might spawn.
I remember a thread a while back and someone posted a picture of a bow, I believe a one piece with a foam core, and IIRC it was not one of the full-time professional guys. Meaning, obviously someone sells this stuff. I can;t imagine bowyers are making it it seems like it wouold be some super high tech, highly controlled process.
Someone help a guy out.