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. Why do i have register to get the free boat plans? basically i would like to know my visitors and have the opportunity to get in contact with you.. The firm cecil e boden and associates was established about 1954. prior to that the principal, cecil boden was involved with world war two and post war military and.