A few comments:
1-The Pocket Battleship in GD1938 isn´t the Bismarck class, but, instead, the Deustchland class (Graf Spee, Admiral Scherr and Lutzow. They were 10.000 tons Cruisers armed with 6x11in guns
2-What is VC 6th Fleet, I´m curious...
3-In ATG, you can easily edit ship classes, while you can edit individual ships, it will create a gameplay nightmare because you will limited to 8 ships taskforces, not to mention the excessive number of SFT´s the poor scenario creator will have to edit
4-8h turns will be somewhat troublesome, because you cannot set less than 1day/rounds (althought you could set abstracts round lenght and edit a message setting day and hour each round) . You also might edit night and day effects