Composite cruiser – the primary purpose of this design was to build a small pram style boat that was ultra-lightweight, easy and inexpensive to build, was unsinkable. Boat design and boatbuilding projects, plans, concepts, reviews, and resources. sailboat, multihull, powerboat, and yacht manufacturers and custom builders. directory. Yacht and boat designs, plans and manuals for the home and professional boat builder. power, sail, paddle, and rowing craft..