Heesen Unveil 50-meter 'Maia' The newest Heesen project emerges to the light. It is a 50-meter hull that is called 'Maia', named after a celestial body. The three-deck design is by Clifford Den with an interior by Reymond Langton. It is a full displacement 50-meter hull that is presently under construction at Heesen's Oss yard facilities. According to the renderings, the yacht will be finished in the traditional all-white.