Looks nice, think the simple, functional form fits the civie line pretty well. The current frame for the cockpit canopy seem a bit chunky/excessive though when compared to existing ships of the line. Underside seems a bit underutilised, I know most freelancer ships don't have them but could put something resempling an access hatch down there (unless the pipe looking thing acts as that)
I perfectly agree it could use a 7th turret since as you might have noticed now the ship is bit more bulkier and easier to shot, so extra defence turret would be a fine addition