Does this mean that a pulse laser in a single spacecraft turret takes up five spaces? (mass 0, 0 x 4 = 0, minimum of one, +4 for the turret = 5),To place a spacecraft weapon into a vehicle, simply multiply the tonnage of the weapon by four. This is how many Spaces it will consume, to a minimum of 1 Space. Unless it is to be placed in a fixed mount, it will also need a spacecraft style turret which, at one ton on a spacecraft, will mean another 4 Spaces is required.
This seems odd as the laser in a fixed mount takes one space, which seems very low when compared with other weapons? I guess since you also need the power plant (whilst other weapons are self-contained) it's not quite as bad as it looks.
I take it that barbettes don't need the extra turret as they are a weapon and heavy turret in one (and are therefore 20 spaces each)?