Welcome to spira international home-built boat plans. spira international offers a wide variety of different power, rowing, and sailing skiffs, dories, and other boat. O ur boat trailer plans feature the most modern, up-to-date, and technologically advanced features available to give you a boat trailer thats equal or superior to. This boat is easy to build using our downloadable boat plans. our boat plans are available for instant download so you can start building right away..