Foreward and rear guns

Although there only 2 guns in front and 4 in the rear it does even out. The 2 foreward guns are in full turrets. Their arc of fire is a full 360 degrees in rotation and 90 in elevation. But the rear guns are placed beside each engine. They would only have a few degrees, maybe 5 or 10, of both. It would have made more sense to have the rear guns in turrets also. On the sides of the engine section not buried inside.

Galen: Hmm? Oh, sorry. I was just trying to work out whether a comment from me right now would be 'most wanted' or 'least needed'.
Expect me when you see me.