take a look at atc bead and cove foam. it is a great way to quickly build a one or two off boat. i have used it a few times and love it.
i built two tomcat 9.7s and an open 40 monohul, spirit of canada, with this method and have had no problems with it. it produces something fair and lite. it is just great!
www.tomcatboats.comwww.spiritofcanada.net 
