I would guess the room is fireproof - period. However - I wouldn't want to personally test it with the lack of oxygen! LOL
You are sooooo right on the details. We spent 1000s of hours chasing the right light fixtures, researching windows, looking at granite in 3 states, changing the floorplan as we went along, getting trusses to support 30' wide vaults on the porches without a center column, custom entry doors, tile murals, designing a wall of appliance garages for the kitchen with their own power, and more I can't even remember.
My biggest fail was overlooking power outlets and data connections under the roof eaves for cameras. I haven't given up on this but it will be a giant pain in the rear now - due to no easy way to cable across the living area vault.