The vault will not be easily available to anyone, even if you know where it is. Here is the scenario:
1. At Vault-Tec HQ, you find an electronic note that a message was sent to select senate members at the capital building. The message was encrypted and this note provides the key.
2. At the capital building, on the right wing (the senate chambers) there will be a terminal that still works on a desk. With the encryption key you got from Vault Tec HQ, you read the email to find out they were meeting at the statesman hotel. A man with a locked briefcase would discuss the exciting new vault and then bring the senators to the vault to see it for themselves. The four senators who were to go would each have one part of the code that would unlock the briefcase. You must find all four terminals.
3. At the statesman hotel, you search around until you find the meeting room the senators were in and the briefcase. With the four codes from the senators computers, you can open the briefcase where you will find the keycard that unlocks the V64 doors. Also included is the location of the vault which 'enables' a marker showing where the vault is.
4. At the vault, you find that a rockslide has covered the entrance to the vault. Using a mini-nuke on each of the three large boulders will blow them up so you can enter the place. You cannot use a console command to bypass the rocks and 'activate' the entrance door. I have scripted it so the three boulders must be destroyed before you can activate the door. I also scripted it so you cannot 'drop' your mini-nuke before the explosion, thus cheating the blast scripts.
5. Once inside, you must sneak past the turrets (or blow up your defense turrets) and reporgram the turret control terminal. There is a password 'note' for this terminal if you find the secret access doorway where its hidden. Or you can just hack the terminal.
6. Now, you try to open the inner door only to find that the fuse that controls the door is blown. So, you need to trek off into the wastes to a hardware store to find a fuse. Once its replaced, the door will open and you now have access to the vault.
But, you have to find all the large capacitors if you want to get the three power plants up and running. Each power plant allows one of the following to power up: Materialization Unit, Water Filtration Unit and the Simulation Pods.
There will be 'realism' controls as well that allow you to customize how you want the mod to work.