That is an interesting concept. Reduces the wires need to run through the slip ring. You just need on set of power wires,, and only 1 wire for each servo passing through the slip ring.

I have not gone down the slip ring apporach yet, as for me having enough slack for two complete turns is enough. Wrap up the power supply to the rotation motor with the turrret wires and make it the short one. It will pullout first and prevent any harm to the rest..