The top and bottom turrets face up and down respectively. This is due to their "position".
We've got guns for the front (by pilot), left and right turrets, have no use for rear, and no use for bottom.
Take the turrets on the top and put them into two seperate groups. The front section (facing forward) should go to "Forward" turret section (move Forward away from where the pilot guns are). Take the were-rear turrets and put them as the second (rear-facing) top turrets.
Take the top-turrets, use a smaller gun mesh, and line them along the main body facing upwards. I'd personally probably use those for Flak.
Take the bottom turrets, also with a smaller mesh, and line them along the bottom of the ship, or along the pods. This will get rid of the awkward-facing turrets as they are now, provide a more canon feel, and still maintain balance, allowing players to use the Galactica as a broadside or direct battleship as it is meant

Just my opiinion and I apologize for wall of text, but just throwing in last-minute stuff