I think the level three hack should be able to hack enemy turret nubs - as it is the enemies never have a turret to hack anyways.
So when they build it out the new turret is yours? Or you just want the nub hacked to know you did it..?
Hmm [thoughtful chin scratch]. This is of course assuming that once the turret is destroyed, it returns to the original team. And since the danger of Hacking is mostly gone (i.e. the turret itself), the turret should not have the advantages of being hacked
That would turn into a lockdown, and give a team the ability to spawn camp without being around. Not a fan.