Interesting.
From the look of things, I am wondering if there is a beam on the other side of the zinc that the junction box is mounted to, because I can't see a row of tek-screws that would indicate a cross member behind the zinc?
I can see tek-screws about 20% up the lettering. If there is no beam/cross-member behind the junction box, I would be concerned about vibration of the camera. At zoom any vibration is amplified by a magnitude. Hope that I am wrong.