So speaking of security I was thinking we could make a vault... Then comes the complex issue of security..
Then I was thinking, why not makes this fun... Instead of a combo lock, how about a labyrinth with a community set of chests at the end? Thus keeping nosy griefs out.
Also unmodded it seems unwise to use bedrock http://www.minecraftwiki.net/wiki/Bedrock bad placement is permanent.