Is it really so important if the Hood were BC 2 or 3?
Especially in the case that we won't have these models anymore in HoI3
I don't know exactly the historical stats of these ships but i am quite sure it won't be possible to simulate them with 100% accuracy in a game...
So who cares on such details?
I think it is very more important that the differents of the ships will be used in the game to simulate the outcomes of battles.
If speed will influence the result of a battle, speed should be in!
If max range will influence it must be in etc.
But i am quite sure some details like the colour of the painted whore in front of cannon 3 is black or blue won't influence battle results...so who cares?