This is very interesting....damn good job with the fixes (so far).
I'm trying to get my head around all this, i.e. how the turret's motion is limited by placement (or mis-placement) &/or turret camera placement.
With your Xenon K fix, from badly rotated down turrets (turret bodies inside the ship!) to odd looking 90 degree mounting,
I can see & understand the 'firing cone' is far better i.e. firing cone is downward.
(If one considers the turret motion to be un-limited by the ship body / cockpit camera position).
But a nice looking down turret mounting angle (180 deg scene-file rotation) doesn't have a 'down-looking' firing cone any more than the original orientation.
(-all this is assuming a maximum of +/-90 deg turret body rotation & +/- 70 deg barrel tilt - which obviously must be being limited by some in-game process?)
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Are you saying ES didn't design the turrets to look correctly mounted, as well as at the same time having a firing cone covering the intended 'direction' ?