My question raised after many spreadsheet calculations considering both. I'm drawing a WIG craft with capabilites of flying up to 150 metres high. The cockpit will be built around a fletcher 12ft speedboat hull wich is 1.55 meters wide (beam). I'm calculating the wing load with just the wing lenght solely. For a 8 meters wingspan (without cockpit and 1.8m chord) I'm achieving 50.59 Kg/M² which is my limit for wing loading, but if I include the cockpit in the wingspan this value falls to 42 kg/m², but does nt seems correct to include 1.55m of non lifting surface in the calculations. What I'm trying to do is to make the wingspan as short as possible but keeping the load under 50kg/m² to permit the takeoff from the water. Any consideration in the above will be appreciated.