Brady,
You are going a much cheaper route with a 75-85" 4k display. That's a good thing. If I had to do it all over again, I probably would have gone that route. I love projection, but now I am stuck with it and backed into a corner by its costs in upgrading to 4k.
Stick with your plan to...
Brady,
I want to get you the advice you need. I am not a handyman. I built a very generic home theater in my basement. I can't speak for the in-wall wiring work or anything else.
If you are looking for a place to start hardware wise, my advice would be perhaps Denon's just announced...