I'm assuming you're familiar with Silent 3ditor found
HERE.
Loading the particular Conning Tower .dat file into S3D, you'll see the attached models/textures found within the .dat file. It will contain the gun mounts....Slot_A01, Slot_A02 for the Anti Aircraft guns. Actually, just open the Model in the right hand pane of S3D, left click the "camera icon" along the top menu group to center the model. Then zoom in with the mouse wheel to get a better look. Use the arrow keys to circle around, or mouse drag over the model. By clicking on the various small dots that show up on the model, it will highlight the various parts within the "Node:" list (in the left hand pane).
To pull the periscopes up a bit, Find the periscope Node, usually a child node found under the parent "Periscope Mount" heading. The "cfg_O02" is usually the Attack Periscope. The cfg_ O03 is the Observation scope. Use the "Position" Coordinates along the top of the right hand pane to reposition the different modeled objects. Or, just delete the Node in question if you don't want to use it at all.
The crew are usually found with the Node name of "WCS_xx_dummy". The xx are for the different men involved. You move them with their individual coordinates.
See what you've done, by loading the .dat file into a JSGME compatible mod of your making. Call the main folder "My Tower"...or whatever, within it make a new folder called "Data", within it another called "Objects", put your .xxxxx.dat folder there. Load through JSGME into the stock game your mod. Start the game.