The main issue you'll run into, and basically the same reason I abandoned this same idea for my Lumina is the fluting on the headlight lens.
That's to distribute the original halogen lamp's beam pattern in a desirable way, to have projectors work properly you really need to sand that all down and re-polish the lens clear. Otherwise most of the benefit of the projector will be lost.
I did see some people on other parts of the internet vacuum form lexan or composite material over OEM lens to create a clear cover, but that's outside of the scope of work I'm going to be capable of. After endless sanding on a test housing I had I threw in the towel, I think the miniquads are glass so that might even be more difficult.
As for the legality, technically straying AT ALL from the DOT approved lighting that came on your car is illegal. I'd say its extremely unlikely anyone would ever pitch a fit about it unless your state/provenance/territory has laws around that for a safety inspection or, of course if your car is SO obnoxious that it gets noticed for that.
And TBH modern OEM LED headlights on pickup trucks I find to be AT LEAST as obnoxious as some of the dumbest kids putting 6000k HIDs in factory housings on their cars back in the day so thats just where I stand on it.