This is only my opinion of course you can take it just at my .02 I would probably do my trans pan chrome, and maybe the rear diff cover other than that I wouldn't have anything else chromed again just my .02
As far as A/C goes there's probably got to be a vendor like LMC, Brother's, Classic Industries, or Classic Parts I think there called that would have an in dash unit available or be able to part it together.
Are the scratches on the inside of the window or the outside. I would think regardless the tint would hide it, it would probably just be visible if you were inside the truck. Here's an example for you in my old car I had mine double tinted and went to help a friend well part of the jack scratched the tint off and you can only see where it cut it if your looking for it. I think that tint would look good personally but again I like darker tints myself.
I've heard great reviews about the dynomat but I think I've also heard people say its a little on the pricey side, if I'm not mistaken I can't recall his username but there's a gentlemen on here that actually sells something like dynomat with supposedly good results.
I hope you find my long winded post some what helpful and answer to your question if not it's okay I understand
