"When all else fails, cheat" - Joliet Jake, "The Blues Brothers".
Them crooks are gonna charge me cash money just to move the deck gun from one end of the boat to the other I'm just gonna steal the money.
A career start has choices for year, home port, sub type, and renown - that defaults to 1000, but I always change it to 2000 before going into the office because I know they're gonna gouge me to move the cannon to where they should have put it in the first place. If I do figure out how to change the default from stern to bow I'll let you know, meantime increase renown before going to the office, then spend the extra dragging the 3"50 bow gun to replace the stern gun. Better still trade it for a 4"50 bow gun.
"Why would I want a stern deck gun? Who am I running away from?" - Sam Dealey, USS Harder