Open/dayboat, free sailboat plans hobby kat. everyone who digs boating has heard of the hobie cat, the sleek little catamaran that burst on the scene and captured the. International class association; uk mirror class association; irish mirror class association; west australian mirror association; ontario mirror dinghy association. January 1, 2001 go build a boat by monte rhodes. what is it about building boats? why do so many of us have a need, or maybe even an obsession to build boats?.