Listings 1 – 20 (out of 22) new or used custom carolina boats for sale on boattrader.com. view the best selection of custom carolina boats to choose from.. 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. The leader in custom boat docks. located in anderson, sc, custom dock systems, inc. has been a leader in dock manufacturing in the southeast for three generations and.