But, I have several advantages over the mentioned ships: First, I propose no armor so that is a massive reduction in weight. That in turn brings down the needed displacement considerably. Next, the guns I propose would not need high velocity and they would be using lower weight high capacity shells only. This reduces the powder requirement per round and the shell weight. This in turn reduces the size of the magazines. Additionally, the ship would only be carrying about 40 to 60 rpg rather than 100 to 200 rpg like a monitor or battleship would. This is because I would be expecting to need fewer rounds for the mission intended rather than expect a firefight where high round expenditure would be required. This too reduces magazine size. The 10 to 12" size is required mostly to get a sufficently large ASW round to do the necessary damage and have a reasonable chance of success. With only two screws and less engine and bolier requirement the size of the main spaces would be reduced too. After all, I don't intend the vessel to be particularly fast. Secondary armament could be limited to just say 4" or 5" AA guns if necessary to reduce their footprint and weight too. But, generally speaking, pedistal mount single purpose guns don't require alot of space and weight to mount for some surface fire capacity. These are really an add on. Now, the hanger and catapult will take up some space but very little weight so their displacement is nothing and mostly a topside superstructure issue. I'll see if I can do a rough drawing of the proposed ship over the next few days to add to this.