It's not flat because that's a preview pic with software called imandix, which most of the cover artists use. (You must have seen these previews before?) The 'flat version' is in my box.net as it says above.
(Arseen was making a joke above)
I didn't put the boxes on it because I didn't want to spend too long on a cover that can never have a disc in the box. I didn't know how much disc space, players, etc it was, and I spent long enough looking for the code for the spine. (Can't trust the info on the cover you provided, as for a start it has a blu Ray logo) Feel free to add anything you want to it, as I said, I won't be making any further changes to it.
As a side comment, no offence taken or meant, but surely your opening comment should have been a thankyou?