I think I used the same eBay grille pieces as you. I was surprised how well it fit and the quality of the paint, and it was way cheaper than the other options out there.
I vinyl wrapped the roof rails, window trims, lower door pieces, and the trunk piece with “GMC” on it. Most of it was straight forward but the lower window trim was very difficult and required 3M knife less tape since the rubber seals are glued down to the trim.
I also vinyl wrapped the front and rear GMC logos so that the center of the letters were white. This was also pretty difficult but gives it a unique look that you can’t buy online.