If you find an issue, please report it here. Also here are some solutions to common problems:

Make sure all blocks are set to the same ownership.

The script will turn off guns if the target is out of range. If you want your guns to be always on, make sure that the gun range is greater than the default convergence.

Option 1: check the weapon mod page.
Option 2: use trial and error.
Option 3: Go to the mod page, copy the id number of the mod that's in the URL (something like 12345678), go to C:\Users\<username>\AppData\Roaming\SpaceEngineers\Mods, look for the sbm file with that number, open it in 7zip/WinZip/WinRar, open the Data folder, and look for Ammos.sbc. Open it using any text editor like Notepad and look for the line with <DesiredSpeed>. That's the projectile velocity. By the way, <MaxTrajectory> is the range.
Vanilla gatling weapons have a velocity of 300 m/s and a range of 800 m.

To properly aim the director, it's necessary to look through a camera mounted in front of it. If your camera is shifted from the director, the aim will be shifted as well (even though the crosshair looks on target).

The script turns off the guns if they're off target or out of range. Unfortunately, this has the side effect of interrupting the guns' sound effects. At the top of the script there are settings to prevent the guns from turning off (turret_threshold and only_shoot_in_range)

Yes. You can place turrets (both AI turrets and rotor turrets) in any location and at any angle. Just make sure that the orientation of the remote control block matches the turret's own orientation.

This is because the script has to calculate the orientation of the turret (since there's no API for it), which is inaccurate at turret elevations above ~45 degrees. I'm looking for ways to improve it.