The concept was born from an "urgent need for an ecological transition in the world of yachts" said Corradi. Its eco-focused design takes inspiration from the solar towers of California and features a solar panelled foredeck and a 'solar concentrator' on the top deck that gives it its castle-like profile. The energy produced by the solar technology feeds into a generator and powers both the hotel load and the battery behind the concept’s electric propulsion system.
Stand out design features include a beach club left bare for a prospective owner’s choices, with twin staircases leading up to seating on the spacious aft deck with turret-like bulwarks. Forward is a circular saloon area with sofas and an office space to starboard.
Elsewhere, the concept’s upper deck hosts an art gallery alongside an entertainment centre. The lower deck hosts amenities such as a gym and spa area aft with a library forward.
Accommodation meanwhile is for six in three cabins comprising of an owner’s suite on the main deck and two VIP guest staterooms found on the lower deck.
Castle also features a spiral staircase amidships which connects all the interior rooms and cabins. Corradi described the element as providing "a feeling of elegance and a sense of elevation by connecting several rooms at the same time and separating the routes on board”.