Love seeing builds like this, after going through my own last Winter, and sharing it here.
I learned a ton through the suggestions of other members, looks like you thought it through very well from the get go.
Man, that really was a lot of blocking for the TV! I just made sure that there were studs where I was going to mount it, and left it at that. I did add blocking to the framing where my surrounds were wall mounted.
Sadly, my "cut a 1 inch hole and fish for the wire and then hide that hole with the wall mounted speaker" pales in comparison to your very nice and proper pass through with a nicely finished wiring look!
Looks like it is coming together nicely, you folks must be getting antsy to get in there and kick back.
Nice work.