Like loads of other people, I used that backdrop on my CPO.  I Can’t help you with the hex background, but for Halo placement I simply created each button as separate layer and then used Photoshop’s ruler in order to place each button exactly where they were on my template.  After the buttons were placed, I then knew exactly where to draw my Halos.  You can always go back and delete the buttons if you don’t want them for a drilling guide.