no vent plug.....plenty people do them, go ahead and try one... I have done a few and am currently trying the carbon in a few different ways to get the flex feeling right......
also some info on a thread called ' playing around with flex in tail ' but there is plenty of carbon info on these forums...the boys at shapers are good to deal with.....
the search box at the top right should answer all your questions. all that stuff has been discussed ad nauseaum (spelling?) except for putting the carbon on the rail. add "shwuz" to your searches for that. he did some really good looking carbon railed boards and gave some good advice on how to get it done.