The Dutch-made Zeelander 55, an upgrade from the company’s popular 44, is a head-turning, luxurious express-type cruiser with hints of both a Down East lobster boat and a Gold Coast commuter boat while announcing a style all its own. From its fine bow to its torpedo stern, the Zeelander 55 is as contemporary as it can be. It’s all curves; there doesn’t seem to be a straight line anywhere. One of the most striking aspects of the Zeelander 55 is the 360-degree view from the helm; actually, from anywhere in the salon. The wraparound windows have narrow frames and double-curved…