Here is my redstone bank. It uses the chest-minecarts to deliver your stuff to you.It can a changeable amount of minecarts, each minecart having its own pin. The pins can be from 2-10 digits long. I have made it with 2 carts, but you can make it larger. Also you dont need a rail per cart i just made two so i could expand it more eventually. I made a vault with a 9 button lock before on SMP, but the map was reset before i took screen-shots of it.Let me know if you want a map download. One more thing it can be a little bit buggy at times if u randomly pull levers and press buttons. Thats all about it, if this gets enough diamonds I might put a map download, and if this gets enough diamonds ill make a tutorial