That sounds like a fun but tricky project. Start by treating each safe room as its own vault: use a strong, unique key for each, and store those keys in a master lock that only you can open. Make sure you audit every layer—check the keys, the access logs, and the encryption algorithms. If you can, add a redundancy step so if one key is lost you still have a backup path. Finally, test the whole system with a controlled “dream” run‑through, and document every move—those notes are the first line of defense.