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Ok, I just made this up today, so not sure if anyone else is as smart as me

or as stupid lol, anyway I tested this with my m8 and I was only tested it we didnt go all the way we just went to lvl 13 then stopped, but it has potential.
OK I'm pretty sure you all know the basics, get points and what guns you need.
Step 1
Start on garand side, and work your way through to the power room,(you could stay there till you all have good weapons / perks and points, then through to the double tap area, the stairs at the bottom should be closed.
Step 2
Once you all have decent guns and perks, head down the the bottom of the double tap area near the wall(next to the stairs), now there are two bays , the left is where the double tap is and the right is where the balcony is.
Step 3
Have 1 Guy stay near the wall, and have 1 guy on the right bay in the left corner, all the zombies will target him you can have the other people next to him or behind him, as long as you dont have someone on the left infront then it should be ok.
Ideally you should always place some betties on the left bay between mp40 and doubletap area, so you are warned encase any zombies change direction, but that would only happen if someone made a mistake, but best to be careful, the wall should get 4 zombies max, plus its a lot easier to manage,
Its upto you how you would want to do this strategy, me and m8s are gonna attempt this again to get to around 30 at least.