No big deal but I would make the front of the screen completely flat, so the bottom part is in line with the rest, I think it would make it more professional looking.
Maybe the opening for the panel could be sloped on the sides as well.
Also, if you could in-fill the engraving of the buttons with white , it would make it much easier to read it.
Maybe not such big of a crime to "steal" some design clues from other manufacturers, personally I really love how the Xenarc displays look like.
How about the stand? I trust there will be at least dash/windscreen mount version?