Okay, now that I've just woken up for the day, I will admit that full interior would be a problem with MP
Perhaps they can have it be in an add-on and revert back to the non-interior version when the player goes online?
Either way, I was thinking about what Jason DeDonno had said:
One way or another yes, I want the whole interior. Whether this happens in Ship Simulator or not depends how VSTEP want the Ship Simulator concept to develop.
That sounds to me like he's going to model a complete interior to his Titanic model, whether it gets in the game or not.