The frequently suggested ship cabin was to make 'mobile houses' of sorts, being able to just anchor your ship, or fly your ship and be able to decorate the cabin inside it.
I am very sure houses will be available that offer hidden or secret areas to explore, in the future, similar to the grand houses available in Wizard101 that come from all the bundles.
coolster50 andShiningfantasia good ideas, I personally think bot would be good, add lower cannon/house decks to the ship house idea and make skyways for your multiple houses avaible and boom! Every one likes it even more!