C-trawler 29 is based on the same seaworthy hull designed for a nova scotian boat builder who wanted an able motorsailor to use in open waters of the canadian maritimes.. The coastal passage 30 was designed to fill a niche in the small trawler market. designed in collaboration with charles neville, noted trawler designer, this trawler. Boat plans and boat designs from select naval architects, yacht designers, and marine architects. powerboat plans, sailboat plans, monohull, multihull, and trihull.