If the high cost of factory-built flats boats is crimping your fishing style, then build our flats flyer. you’ll get a flats boat exactly the way you want it at a. 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. We now have 40 hours on our new ibis. as you know we fish 75 – 100 days a year out of port o’connor and were looking for the perfect boat. our ibis is in fact the.