I like the idea, but I doubt it will be realised anytime soon. I do not know how well documented said ships are, or who owns the rights for them, and as you might know both exact specifications and performance data - in addition to the rights to use the ships - would have to be in place first.
More important though, I think at least, is that there is not a lot of difference between the various old oceanliners. Vstep has made it clear that they primarily want to add vessels that add something new to the current fleet, like a new way of handling or a new role. It is AFAIK not finitely yet confirmed if the Titanic will be in the game or not, but if it is, it will cover the (old) ocean cruise liner role. It would be hard to justify the use of time and resources to create even one of the mentioned ships for the game as it would no add significantly to the game as far as a simulator. If anything, a NEW ocean liner would be more likely, and then I guess the QM2 is the only option. That would also add something new, the highe speeds achieved by its CODAG and its seaworthyness that surpasses the cruiseship/ferry in the game.
