I was reading through the fleet boat manual about the armaments and it was standard doctrine to put the 40mm on the bow smoking deck, if one was installed on board the boat. I don't expect us to reweld the whole superstructure, though.
Speaking of welding, at some point we need to add ammo hatches to the foward smoking deck and I think a lot of boats had the detachable can storage on the aft smoking deck. Check out Pampanito, if you're not sure what I'm referring to. This is low on the priority list, but a necessary item, none the less.