Re: Coffered Ceiling - 6 sections or 9?
With the ceiling coffered, I would suggest 9 (with the center being the 9th square). And I'm getting a strong sense that you should make the corners larger than the intermediate sections so that the corners extend down each side a little around the corner, particularly if the center square is larger than the perimeter squares.
Like this, see how the corner square wrap around the center?:
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!