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. 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.. Glossary of terms used in boatbuilding and boating. boat speak terms we use to describe our designs. this glossary was originally published in our webletters..