Plans to build the 23′ matagorda flats catamaran boat. the matagorda was designed a fishermen who wanted a very stable, reliable and flexible catamaran to get in and out of very shallow water bays, inlets and bayous common to the gulf coast of the united states.. Wooden boat plans and kits. many boat plans are offered online. at first everything is very confusing, then you start to get some idea of the different types of boats available.. Free plans: the 13′ rowing dory assay (free downlaodable plans with full-size pattern from classic wooden boat plans); absolutely free plans (links to free online boat plans).