What's happening when you are trying to sleep now?
Let me begin by saying your post was well written, photographed and curated. Thanks for making such a contribution. It was so impressive that I did this same build as well.
Now, to my problem ( ):
My kexts look exactly as yours are. When the machine goes to sleep, it won't wake up. As well, when I shut down, it shuts down and then starts up again.
And, one other problem, for a dvd drive, I couldn't locate the same, so I used an OEM Lite-on 24x DVD burner (DH-24AAS) bought at newegg which doesn't register disks that I put in, though the bios sees it.
I still plan to try and find a wireless card to replace wired lan, but outside this am quite happy.
Have you started overclocking? What was your experience like with that?