Thanks for your help so far but still so many questions...
Vanishes, as in, turns invisible? Or is it gone completely? What happens to the ship that docked with
The installation just disappears from the mission, it's not on scanners, and you can fly through the space it used to occupy on screen. The docking ship (in this case a GTT Argo) remains and seems perfectly happy although it now has no orders.
1) Make sure that the axis of the tricky turret objects is in the centre of object (Truespace).
Ok I can fix that, I have some problems with this model where I had moved all the axes to the centre of the model

just checking though, do you mean the axes for the turret sub group (i.e. the geometry and the light) or just the axes for the geometry (there seem to be two in TS for some reason

)
Are you sure it's not a mission bug?
I replaced the station with an Orion and it worked fine.
you need to points
Two points? I’m using Aurora, through I set up the location of the two vertices manually, the first point is as close to the hull as I can make it, the second point is aprox 1.8 meters up to set orientation and 0.8 meters out from the hull. What normal should I enter in the two dock point vertices? The dock is perpendicular to the port side of the station.
And while I’m at it, where should the last vertex of the docking point path be in relation to the dock point.