heres an idea.
dont carve it out of a block of carbon fiber or graphite.
just make it hollow, use carbon fiber cloth, that can be bought for about 8-13$ a yard, buy a couple of yards, then just make a body jig, put the carbon fiber cloth in there to fit to your body shape, then epoxy it up like they do surfboards.
should probably use at least 5 layers of cloth.
http://www.hollowsurfboards.com/Surfboard_...ng_Bottom_1.jpg
i shaped and glassed a surfboard a few months ago, was alot of fun.
also, you wont need to do any kind of finish to it.
they do what they call a 'hotcoat' in which more catalyst is mixed with the epoxy, and it will kick faster, put that on with a brush and you can get a nice thick smooth finish you can sand with a softpad and 320grit on a power sander.
http://www.hollowsurfboards.com/Surfboard_...rd_7/Tail_1.jpg