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.. Work boats – fishing boats – passenger boats – boat plans boat cutting files & boat kits – 21′ / 6m – 78′ / 24m. the photo shown here is of the euro 1200 coastworker ( 12m / 40 ft ) and is typical of our purpose designed work / fishing boats.. This page provides a list of our currently available boat plans, a link to the web page for each design, and a price for each design. incomplete or ‘semi-stock’ designs: prices given below in plain text indicate plans that are incomplete. why, you may ask, have i even bothered to list incomplete.