I wish I had wood working materials to do so, then I would make a box to fit properly. I'm going to see if my friend's friend can build me one since I see him building boxes all the time.

A capacitor, what do they do?

I noticed those kenwoods are 1500 each, impressive. I of course will have to upgrade to the Al129x alternator, problem is finding one. I'll post in parts.

I have wire crimpers but no soldering iron, I could crimp and heat shrink the ends as well.

amp wise, I want something that can power both of them but still retain my bank account.
Also, what about the head unit output? Is that a concern? It's a $120 sony head unit from wal mart.