I actually saw a 10 minute video on vimeo on how these cases are made. This WAS the link:
http://vimeo.com/4255111
Renaud and Papi obviously took issue with this link. I don't mean to oversimplify, but basically the cases are made of chopped strands of carbon fiber that were preimpregnated with polyamide(nylon) resin, not epoxy. Since I saw the video I don't mind sharing what I saw. A steel die was carefully filled with a premeasured(by weight) amount of these chopped fibers. The die was then heated in an oven to melt the resin, taken out, an then pressed to consolidate the case. Maybe not a DIY project but not a difficult process either. I've read elsewhere that it takes 20 minutes to make a case but that there is also a 20% rejection rate. Hope I didn't bore anyone.
Here's a link to pictures of the process:
http://professionalwatches.com/2009/04/audemars_piguet_-_forged_carbo.html
Regards,
George