This superstructure for the Omaha cruiser is based on the 1923 version - essentially the simplest one I could find.
There are several versions of the aft superstructure. One is plain, no holes for guns (aft ss no gun holes). The next one is for guns that will exit through the top casemate (aft ss top casemate). The third on is for guns that will exit through the bottom casemate (aft ss bottom casemate). The last one is for guns that exit through the bottom casemate at ~ 10 degrees down angle and 7 to 12 degrees side angle (aft ss high angle).
There are two versions of the forward superstructure. The first has no holes for a gun (bow ss 02). The second is for a gun that exits the front of the superstructure (bow ss 02 for bow guns)