It's not that it isn't accepted, was just pointing out that you would need to make it fictional
Good luck with your mod, I tried to model the Alaska a while ago (It being one of my favourite WWII ships) but like always I stopped halfway through
The Des Moines class shouldn't be hard to do either, it's basically a Baltimore with super-fast-firing guns (The 8"/55RF Mark 16s could refire every 5 seconds)