Hi Paul,
If I were you I'd not run the power cable through the mount! There is already a camera power cable running to the versa plate. It's unpowered but there is a socket at the bottom of the mount where you run your camera power in. SB sells camera power leads with their plug on one end and the camera power plug on the other. Or, you can purchase a lead with their plug on one end and bare wires on the other so you can add your own plug. That's how I did it and it works fine! I think 4 wires is too many, but I've got 3 running through my mount (but not a heavy power lead!).
Peter
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