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.. 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. I believe in offering you all the information you need to learn more about how to build a boat. that’s why i offer free videos, free ebooks, and free reports..