Before I begin, let me state that I have not seen or examined PPR's grille. I have no idea of the part's quality.
On Moparts.com, I believe it was Scott Harms of Harms Automotive who described in detail the difficulties in making a proper large plastic grille, such as for 'cudas. His company, or somebody he knows, looked into what it would take to make some grilles. To paraphrase, problems with expansion or shrinkage of the finished product will give you fits trying to put on tight-fitting pieces such as the stainless steel trim found on the 1971 grilles.
Without pissing on PPR's Corn Flakes (or disparaging their efforts), I would like to see their grilles at a Mopar show. I would also like to see how well they accept the stainless trim, "cheese grator" inserts, headlight rings, etc. From what has been tossed around on Mopar Q & A boards, it's no easy task to produce a grille of that size.
Whether PPR actually produces a grille seems to still be unknown. I have a grille so that question is not keeping me up at night. But if PPR (or Penstar Reproductions) does make a bare grille, good luck trying to get all of the other "trim" pieces at a reasonable price.
Larry