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. Boat speak terms we use to describe our designs. this glossary was originally published in our webletters. if you have any suggestions for additions, or corrections. Specializes in stitch and glue, epoxy/wood composite designs for sailboats suitable for home builders. also offers a boat building video and book..