The stunning 42.5 meter (139.4 ft) trimaran is currently being built in China for Hong Kong Clients, Anto and Elaine Marden. Designed and engineered by the world-renowned John Shuttleworth Yacht Designs, the Adastra is a beautiful machine and I can’t wait to see the finished product. Motor yacht Adastra is a very interesting superyacht which is designed for ultra efficient long range cruising. The striking 42.5m Trimaran Adastra was designed by John Shuttleworth Yacht Designs and is currently being built in China for a Hong Kong yacht owners Anto and Elaine Marden.The Adastra took more than five years to design. It is over 42.5 meters (139.4 ft) long yet has been made to be light weight enough that is is relatively fuel efficient. You might wonder what a monster like this yacht sells for and that would be a great question, unfortunately, I don’t know. But I imagine it’s just ever so slightly out of my price range.