I can't comment on you actual question but to me $5800 for a tiny 83" TV seems like a waste of budget.
You could have a very good projector and a 120" drop down screen for that price and add inexpensive large TV for lights on events (behind the drop down screen).. Yes this would require more time and research to learn about projectors and other things (room environment) that impact the image or projection, so maybe not your cup of tea but figured I would mention it. I can tell you a 83" would be nice, but would not be very immersive.12' or 14' seating distance..
Good luck with your project, it will be a journey no matter what you do! One day I hope to be able to build an entire room like you are about to do, but for now I make do with 120" screen and 2:1 in my living room.