Purchase plywood motor boat plans for the harbor master displacement 19. we have created wooden motor boat plans for the next evolution of classic dorys!. 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. The task was not simple for this design. make a 15 feet boat with 4 bunks, head and pantry. suitable for outboard engine, electric trolling motor and pedal drive..