If Turret07 model is replaced, great care should be taken not to accidentally alter beam fov. Beams seem to be turret barrel's fov meanwhile everything else uses turret base fov like set in pof properties. While I know very little on this, changing the turret model too much would likely alter beam's fov and in turn mission balance.
For funny trivia, if you use $force beam turrets to use normal fov: YES in ai_profiles.tbl, both Cain and Lilith become incapable of firing at targets directly in front of them because turret base fov is too narrow to do that. Turret07 is pointing directly below, not forward like you'd think.