A custom superyacht is among the most expensive assets anyone can own, costing hundreds of millions of dollars and taking years to build. So when it comes to its design, every square meter matters.For Bart Bouwhuis and Marnix Hoekstra, that often has less to do with the sleek profile or signature silhouettes one can see from a marina, and more to do with everyday practicalities.The pair are the co-creative directors of Vripack, a naval architecture…