Your best bet would be to get with people on here(who we can refer you to later) who build boxes, and have them build it for you to fit your needs, cost you around 200 dollars for the box, maybe a tad more maybe a tad less I dont really know
As for the interiors, they're okay BUT keep in mind if you havnt been doing it for a while, and even if you have,there were always better choices lol, they'll do fine for now, but sooner or later you're *probably* going to find yourself wanted to amplify them, but we'll get to that when you get there
Polks have pretty decent quality, I used to run DB650's in my F-150 about a year and a half ago now, good quality just need some power behind them to get even remotely loud
And the S's have mediocre quality and get fairly loud on lower power