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 designs that are simple to build, rugged and seaworthy.. This directory includes all of the plans that are specifically designed for stitch and glue construction. the rc model x-1 is an inexpensive way to try out this popular contruction method.. 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..