This idea looks damn interesting. Did you actually make it, OP? If so, how? I've found this old thread and now I want to do it too. Because I freaking love boats. And I want to buy a new boat. After I read this post I want to modify it also after I will buy it. I think I will buy a small boat for this. When I want something big and luxury, I just use yacht rentals - I rented a yacht last summer and it was the best vacation ever. I will do it next year too.