Ah, but there's a catch. Cob2FS2 is fine for fighters when you're just using gunpoints, but if you don't convert through PCS, turrets don't work. Simple as that.
I've tried Cob-->Pof conversion outside of PCS and then tried editing turrets with PCS........doesn't work.

EDIT: I've got hold of the Cob2Pof higher limits version. The ship does convert, but I'll bet you that the turrets don't 'exist' as far as FS2 is concerned....
EDIT2: Problems:
1) Doesn't carry the textures with it.

2) Although it's been converted to an FS2 pof, PCS doesn't recognise it as such.