Congrats on the new safe!
I'm in the market for one at the moment. A good fire safe with no outer hinges.
I actually almost made my downstairs bathroom into a walk in safe. We've been finishing my basement recently. The bathroom was already studded/stubbed and I gave it alot of thought about sheetrocking the outer as normal. But cinder blocking the inside walls and putting a good metal door on.

Believe it or not.....the wife wasn't totally opposed to it when I told her it could cross as a storm shelter. But I figured a bathroom was better for resale value than a safe. Plus, the bathroom is small and is only 5ft. wide. So after the cinder blocks, it would be only about 3ft. or so wide. So I decided not to. Oh well.....maybe in the next house.