Clean install!
You did a great job building that box, design is nice, and I can tell you are a fairly talented craftsman with wood. (no pun intended lol)
Zero gauge is always overkill to me,.. but I like overkill to be honest. The 4 Gauge I ran throughout my car for 70x4 + 270 x 1 .. for one amp is a little overkill.. I have no doubt 8gauge would have powered it just fine...
Similarly I ran all new speaker wire replacing all the factory wiring,.. and ran 14 gauge KnuKonceptz wire when pretty much everyone told me I was being a moron and the factory wiring would "handle" my 900 watt amp just fine,.. And I don't doubt that, but I feel better that it's there.
Similarly you already have the "Big three" High output Alternator, Zero gauge wire, and a seriously expensive battery. You've prepped this car to literally handle most anything you throw at it now.
Like the previous poster I am curious at your factory mids and highs? Did you replace those? Or have you just put subs in it and are running factory mids/highs ?
If so, what are your plans for the Front stage?
Also, keeping that headunit? Or going to move to a Double Din headunit that is like a Mini-computer nowadays with DVD, CD, USB, Bluetooth, Touch screen, yadda yadda..
I know some people don't care anything about the way a headunit looks really, and like some of the Single dins for the Audio quality (not knocking the Head unit you have,.. just curious is all.)
All in all,.. everything you've done thus far looks like you certainly know what you are doing and are doing it right, which is what I like to see in these builds.
Oh,.. throw some tire shine on those tires, lol. That pretty new car and those dirty tires, //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif