You're supposed to build those things from scratch so you can custom fit all your gizmos in a tasteful but unique display. Then you could have taken off all week to get it done.
I don't even have that much AV stuff. It's really just a TV and four boxes (cable tuner, receiver, PS4, Xbox1). The real pain is that I keep my network stuff in there, too. So that adds a modem, router, and Ethernet switch. And I wire the TV and all the boxes into the switch. As a result, I have enough cables stuffed back there to stretch all the way from here to Atlanta.
The funny thing is that 20 years ago, when I was living in an Air Force dorm room, I had one of those insane Kenwood component stereos (back when Kenwood was still considered high-end) that had like 8 separate boxes all by itself- CD player, cassette, turntable, radio tuner, equalizer, power amp, and a couple others that I can't even remember. And then on top of all that I had a cable box, VCR, and Sega Genesis. And all that crap was MUCH easier to set up than what I have now.