This design (plan) is a 28 ft aluminum catamaran. power is two (2) 115 honda outboards. at 8,466 lbs displacement with 100 gallons of fuel, the catamaran achieved 28. Sail and power catamaran plans, designed for plywood/epoxy/fiberglass construction. online study plans.. Sightseer marine, inc. – specializes in custom built aluminum catamaran styled pontoon eco-tour, water taxi, sunset tour, entertainment cruises type boats..