There has been a growing body of literature and use cases for set-based design since its introduction in the 80s. Few studies or use cases involve highly complex systems, though, except for the hallmark work regarding Toyota in the late 90s. Over the last three years, the US Navy used set-based methods to design a complex system of systems: a warship. Their experience provides insight into the scalability of the method and design management considerations relevant to the start of similar projects.