Here are three mods that I did a while ago, the first is a tweek of the 'scope to make it look more interesting and slightly dirty:
Next you have a smaller pipper on the MG:
Last you have a torpedo calculation chart, which I believe CB used as the basis for his in game mod with this data, but this is the original printable pdf version so you can stick it on your wall, should you wish:
These are part of a larger mod package I am working on, but since we have this new thread, I thought I'd stick em on here to get the ball rolling a bit. You can find them here:
Periscope
http://www.mediafire.com/download.php?dzmprpgjeju
MG small reticule
http://www.mediafire.com/download.php?7mjc7y7sms3
Torpedo solution pdf
http://www.mediafire.com/download.php?6dcmzll1u5j
To install the replacement periscope or MG reticule, place the texture in your SOF textures folder, but back up the original first before you do!
Chock