Created by the naval architect Ken Freivokh, the 351-foot Stiletto has a futuristic profile and sweeping interior that makes this Oceanco concept yacht one of the most interesting designs of the year. Freivokh’s inspired exterior features several aft terraces—one equipped with a 25-foot-long swimming pool—that provide exceptional views of the water. The enormous forward social area—unusual even for a yacht of this magnitude—has another swimming pool, bar, recliners, and a shading system. The yacht’s helipad si…