2-part turrets - glue a light as sibling to the barrel, then glue the barrel as sibling to the base (no light glued to the base). finally, glue the whole combo to the hull.
When you make the barrel, make sure to shift the axis on it - this is where the turret rotates around. I can't remember if it's the axis of the turret object, or the turret/light combo, so I normally shift both.
1-part turrets - glue the light as sibling to the turret, glue the turret as sibling to the hull.
LODs/ Debris - glue a light to the LOD hull / debris piece, name it (the combo) detail1 /2/3 (LOD) or debris, then glue to the first LOD object (with turrets glued on). Always glue as sibling, then move it all to its proper place.
Saves as cob & convert - it should work.
NB: The names of objects in ModelView are those of the object and the light glued together - i.e. the name of the combo.
Is that any use

?