If I understand you correctly, you don't want the newly designed CP to have ANY angle at all(you say flush with the ground, parallel is what you mean, right?)?
Wouldn't that require a new piece of Plexi, or do you want the bezel and plexi to stop where it is?
Attached is a pic of what I think you're intending to do (or at least what I would do in your situation).
*edit*
Thanks RayB, gotta screw my head on the right way next time!