If you turn the turret in hammer you will have to change the "Preferred Carry Angles settings"
For the turret to be picked up with right Angle ingame. (facing right way)

One of these you will need to replace the old "Preferred Carry Angles settings" to.

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0 180 0
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or

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0 360 0
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or

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0 90 0
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or

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0 270 0
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View the "turn_settings.jpg" image if you need more help.
Plus you will have to un-group the turrets to get the func_physbox "Preferred Carry Angles settings".

The hard work is done, enjoy 

gtamike_TSGK
www.gtamikes-maps.piczo.com