Yea!!! I love my theater.
As for the 4K question above, I purchase the 4K disk and then rip it to my server. It's then streamed to my theater with an NVIDIA Shield for playback. The server is a 49TB unRAID box running Emby as a docker container. I store all my TV shows and movies on it and can even share the content with my family.
I need another row of seating, but just haven't pulled the trigger yet. The room has a dedicated HVAC system and is built as a soundproof shell. All walls are acoustically treated. The screen wall is acoustically transparent and sits 2' from the actual wall. The speakers are hidden back there so they don't take up space or cause a distraction.
My Dad and I built the entire thing.
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The rack wasn't 100% finished at this point, but it was close.
Here is the server that runs most of the house. It's a 32 core, 2 CPU server with 64GB of memory and a dedicated GPU for transcoding 4K content on the fly.