Ok, experience is the best teacher.
Each wheelwell = 3 screws, grille = 4, bumper = two at the lower grille and 3 under the bumper behind the air deflector. All are 7mm. Found out my area of concern was nothing since the facia slides into two hidden mounts between headlights and radiator.
Moral of the story: Nothing's quite as mentally satisfying as chillin' out, rolling up the sleeves and getting your hands dirty. [?]
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