@F1RacerDan, the tower interior is not open but you should still be able to click on the hatch to enter it (or right click from the bridge while surfaced) like you can in the stock game.
On a seperate note, i just cant figure out how aces (and others) managed to have the ct hatch open for a fully open boat. I never figured out how to do it while keeping the tower interior in a seperate dat file... Just couldnt get my head round it
