This one is not sailing but I really like the concept of this floating loft on a catamaran structure.
Via homedesignfind.com & X-architects Daily
This 220 sqm house boat is located in the Dubai Marina in Dubai. This very modern, minimalist leisure house was designed by x-architect in colloboration with Leen Vandaele. As you can see in the pictures and renderings. The Lower deck hosts the bedrooms, bathrooms, a steering cabin and a deck terasse. The upper deck a kitchen, a salon and an informal dining area.