Amusing to see how some people tend to either completely forget or just decide to ignore the fact that no matter how nice a submission looks like, and how cool it would be to fly it, if the required files for proper implementation are unavailable, then you can put your opinion about it where the sun doesn't shine, because it will not make it's way into the game. It was only one and a half pages ago where Lobster told how has the files for the Oder-class been lost.
However it looks like that the files for the Rhein-class are accessible, so I guess it can happen. I'd like to see it in-game, might even gonna grind a few mills to try it out once.