I have made a mould and made one for myself out of black resin and glass. I never had the chance to fit it due to a customer being in great need. It is a lot of work and this makes it expensive. To make it in carbon would cost about £80 just for the carbon you would also need some kind of suction bag to get a good finish hence the reason I used glass. Might try to lay up a carbon one when I get the time but dont think that it would be cost effective.