These plywood power catamaran boat plans help you construct this modern catamaran for twin outboards. buy power catamaran boat plans & more at bateau.com!. The original bruce roberts sailboat and powerboat designs & boat plans company in australia. boatplans & designs for steel, aluminium & wood/epoxy in either. Study plans are available for some of these designs – remember a study plan gives you more details and a wood materials list usually on two a1 sheets.