When i play Zombies i use the same tactic and usally get to some good high levels
(4 People Strongly recomended)
(Can be done with no perks but is easier with Quick Reload and Jugganaught)
The people who start on the Jugg-a-naught side open all the doors to the electric room. When your 'Re-united' try and get some good guns but one person hold onto 2500 points to get a Deployable BAR or just keep going through the mystery box until you get a gun like the Browning/MG 42.
When you have enough points open all the doors down to the one were the Quick Revive perk is. DO NOT OPEN THE DOOR TO QUICK REVIVE.
All the doors on the map should be open except the door that seperates the Quick Revive room and the room that has a Double Barelled Shotgun and a Thompson on the wall.
When you can, get two people to go into the room that contains the Double Barelled Shotgun and Thompson on the walls and get them to camp at the back of the room by the hole in the wall where the window is which contains the Deployable BAR. The other two people should goto were they started and open the room which has the Deployable BAR. Get one person to use there Deployable MG on the window so you are covering the two people in the room infront of the Deployable BAR room.
The other person who is with the person in the Deployable BAR room should camp outside this room preferably with a Double Barelled Shotgun or Ray Gun.
The people who are in the room with the Double Barelled Shotgun and Thompson on the walls should get attacked by the zombies the most, thus leaving the person protecting the person on the BAR with only a few zombies to kill.
The person operating the Deployable BAR should protect the people in the room infront of them.
Quick Reload will really help you out alot, especially the person on the Deployable MG.
Works all the time for me