Billet grille install is done. Took about 15 minutes and required only a Phillips screwdriver. I took lots of photos at various depths to prove that the results are subtle. I had a few pre-conceived notions before physically seeing the parts and performing the install. I thought that the grille would look gaudy. ....And I thought that I would want to trim out the stock grille. I was wrong on both counts. Post install, I can confirm that the grille looks right at home. It doesn't stand out too much and it blends in nicely with the stock grille surround. As for trimming away the stock grille, don't bother. It's invisible. Might as well keep it there to maintain full structural integrity.
Here are the pix (they're big 'cause I wanted you to really see the results):
BEFORE:

AFTER:

MOUNTING BOSSES:

HARDWARE:

CLOSE-UP:

ENTIRE GRILLE: