
What you need

Make the section into a turret section by having it driven by a weapon

Select section, right click on weapon.

Orange arrow indicates which section a weapon is driving.

Now for the barrels of this turret.

Select slave weapon, right click on master weapon.

Repeat for each barrel on your turret

Position the barrels on the turret section, then move the turret section into your desired location. Make note of its coordinates.

Copy these coordinates to the master weapon to ensure accurate rotation and targeting. Set the Alpha on the weapon to 0 to make invisible and set the Shooting (found in ED2 tab) to disabled (or set Burst to 0) so the weapon will never fire a projectile.

Amazing.