Takes balls to cut in to your bumper like that.
Nice IDEA, though I would PERSONALLY work on the "fit and finish" a bit. That method of securing that flashing to the bumper looks a little "thrown together", and can give the impression that this was rushed, and not thought out. Suggest looking in to other ways of either covering the hole you made, or finishing it so there is no need to cover the edges..
Keep up the good work, its sure to do nothing but pay off in the end!
Ray