Lots of the feasibility of the weapon fit varies from the actuall dimensions and stats of the ship. the beam most likely. Also what should matter is the propulsion and armour, i think when designing this kind of ships, you should start by atleast rough scetch of the internal layout to get grasp on where and what you can stick into the hull.
As for details, those are supposed to be some sort of 5 inch range DP guns as secondaries? As for my personal opinion, for a ship of early 30's that feels bit of like cheating, since apart from the americans, no one else really got there in capital ship secondaries untill the WWII, a mixed armament of secondary and tertiary battery would propably add more realistic aspect.
Drawing wise this is nice thing, specially the "imperial" colors, looks cool nevertheless, so I hope you will continue this desing