Admiral Faier, I am sorry to disappoint you but I am afraid your request has a very low probability to be taken into account. This is not due to Italian Reggia Marina not taking part in WWII, the battleship Roma not deserving our unconditional admiration, or the model pointed by you being flawed by ureparable inaccuracies.
The answer is way easier: the Littorio Class that RM Roma was part of, is already modelled in game. I had already answered you
here. Now, with all the broken/missing features affecting SH5, can you imagine someone redoing your beloved ship, unless you give him a good reason to do so?
Talking about naval units, there are many other
Italian warships missing from game, though if it was on me I would focus on other navies totally ignored by devs, first of all the French Navy, and especially the Free French Navy
