How to a crew perform a stealth job on the Big Bank job

This is a bit off the top of my head, but when I did stealth with my crew we used:

• Default safe crack (Beast, though we never used it)
• Elevator escape (silent, doesn't involve treking back through the bank)
• Spycam (Inside Man), East upstairs (I think, for highlighting guards in the back rooms)
• Extra keycard(Inside Man), for quickly getting into security room without wasting ecms that we might need later.

(With the addition of the new fugitive skill to pick up items in casing mode, the extra keycard is even more valuable as it allows us to guarantee being able to open the server room without risking being spotted by any civillians.)

Our general plan was to find the security room, kill both guards in safe area, find the computer with someone still in casing mode, try and activate without alerting civs (and ecm/tieing them up/breaking cameras if it went bad), wait for new cops, move into back room to stealth open the vault (while avoiding guards).

Generally, we noticed that the guards tend to follow a predictable patrol route, allowing us to easily take the same route back and forth between the vault and the escape with little issue. Getting the top-left vault entrance is one of the best layouts, as there are parts of the office section there that guards will never patrol/see into allowing you to hide if you have a particularly bad patrol pattern.

When doing it with the default escape and without deactivating the lasers (for the achievement) we generally left someone in the front of the bank, allowing us to throw bags through the lasers (bags don't trip lasers on this mission) without risking a player travelling through.