The famous 51-meter Feadship build "Double Haven". A look around and the story of Double Haven with the owners.
One of the cool things about "Double Haven" is her Double Hulled Limo/commuter/fisher tender...I think she is called "Double Happiness".
Interestingly she was just refitted with e-FIN for stabilization. The work saw the upgrading the original Vosper/Naiad fins to Quantum’s XT™ fins.
That is probably not far off what she cost to build as I know what one that came a few years after her cost.