We just built a new cash handling facility. It is a poured concrete "box" with rebar running horizontally and veritically (spaced 3" apart) through the 12" poured walls, floor, and ceiling. I was talking to the IT guys and they had to run some more conduits through the walls after it was poured and said it was extremely difficult to drill even a small hole because of the rebar.
So here would be my idea for the perfect safe room:
1. Poured walls, floor, and ceiling with lots of rebar
2. Drilling sensors in the walls
3. Air unit is isolated from the rest of your house
4. Point of entry uses several layers of security (retina, fingerprint, and voice)
5. Point of entry will be your weakest point, so spend extra money on the door
6. Redundent electrical system (If system loses power, it has backup, and also sets off an alarm)
7. Put the "room" underground
PS...As I watch this mythbusters has a special on security devices.
Anyone who has more ideas for the perfect safe room add them to the list.
Let's have fun with this.
NO BUDGET