So today I started to make mine.
I went for the inside posts only. I used heat shrink rubber on the u-brackets followed by normal insulation tape.
Here is some work in progress shots
Next up:
I am going to spray the bracket black and get some rubber material to place in the middle of the U-brackets on the alu tubing which will help with the tightening against the headrest post
Tomorrow I will try and get a camera bracket to attach to the tubing. I intend to get one that I can still move up and down and sideways