Turret retraction into their tower

[Stardouser]

I thought of this in a recent thread, and someone said it had been mentioned previously as well.

What if the big fixed turrets at bases retracted into their tower when either destroyed, or when not used?

This has several effects that I consider advantageous to the game:
1.Engineers can repair them from inside the tower when they are down, in safety. I am more interested in them being safe from aircraft and tanks that are camping outside and shelling the rooftop than snipers, so, sorry to snipers that wouldn't be able to snipe repair crew, but this isn't really about you. However, repair crew will still be using jump pads to travel between towers, so all is not lost for you snipers.
2. Players on the rooftop won't be able to play peek-a-boo by jumping in and out of the turret. They also won't be able set up a sniping camp on the rooftop and instantly jump into the turret to go after aircraft, it will take a couple of seconds to go down to the next floor and get in and have the hydraulics lift it out onto the rooftop.
3. At the same time, this will prevent casual destruction of unused turrets by aircraft and tanks camping outside. And since it can't be casually destroyed by tanks or aircraft from the outside, it provides another good infantry objective, ie, sneaking into, or assaulting the tower and rocketing/C4ing the turrets, should an empire decide that it's necessary to proactively destroy them.

Thoughts?