I was trying to get as close to factory appearance as I could in my e39, and the bezel I made follows the lines as you can see. In my e53 the HU is in more of an "open" position and attention would be called to anything less then stock IMO this is why I won't be doing anything to the mid of mine unless of course putting in the factory nav. I have toyed with the notion of using a factory monitor and installing something touch screen inside the unit itself to retain factory appearance, but then it would require gutting the entire system again which I wanted to avoid in the X.