Steve, Sounds like you are going to do some things others have not, the Restrictions are on the National webs site. Using Carbon for the Mast and Beams is not allowed. The material that the boom is made from is un-restricted. As Peter has said the restriction are on the National web site. Building instructions (plans) are also available from the association. There are a number of boats being built at the moment Good luck building your own boat it is very satisfying; keep us informed on your progress
Peter