So is there any plugin that can remove building closeness restriction on turrets? I have no problem with it on normal buildings (except when trying to reloc to a vent, d'oh) but on turrets it just makes it difficult to fortify an area, I mean what is the logic behind a relatively huge radius of no build around each turret?

Uhm, to prevent turret farming??

Well, sure from a gameplay perspective it might seem like it would prevent farming, but in my experience turrets cannot be used as "walls" in doors to impede alien passage anymore, which limits them quite a bit IMO. Not to mention I would think it wouldn't be very difficult to make the no_build radius not applicable to turrets, but I am no coder.
Also, I posted it here in hopes someone has a plugin to "fix" it made somewhere, or would be willing to help out and make one.

Well is it even possible to do this?