Pack a picnic, grab the family, and set off for a day on the water in this 17′ picnic barge. designed for sailing on lakes, calm rivers, and canals, this boat is the. These plywood power catamaran boat plans help you construct this modern catamaran for twin outboards. buy power catamaran boat plans & more at bateau.com!. Full building plans (available in both imperial (inches) and metric) our building plans are formatted for a standard 8 1/5" x 11" sheet of paper..