I'm kinda useing this Strat but little diffrent.
First 5-6-7 rounds depends on dogs we all do the same as u say, get the mp40 or the stakeout (most of the times we bought stakeout but im gonna change that).
Then in round like 7-8 we make 2-3 crawlers and start opening our way to the power and turn it on.. We turn teleporter on and close all the windows. Most of the time we dont buy Jugger-nog yet but try to buy few weapons since its pretty easy these rounds.
Then most of the times we all (3 of us only, i dont play with 4)got some decent weapon some of us got an Raygun some got some random weapon like HK21 or an Galil or something and some got the Thundergun (1 mostly obv).
When we got really lucky we got the raygun and the thundergun (on 1 person, but i figured out now it really really sucks haveing them both)..
Now we start @ the teleporter EVERY single round (dogs not we do them in the main lobby) We just wait for the zombies (and when we got alot of points we turn the Turret on) and after a while when its getting really busy their we jump into the teleporter..
Some of us can upgrade some cant. And we start trowing grenades.
Then we get teleported back (and unless we got an nuke in the room u get teleported in) we run to the right, to the MP40 room, to the dressing room and to the Main lobby.
Whats different about this is, we skip the alley. And where doing fine..
Sometimes if we notice its like really busy on the stairs to the Main lobby we just run the same route the other way so from theather to dressing to mp40 to main back to theather.
We keep 1-2/3 crawlers every single round so we can close all the windows (mostly for points because it doessnt matter anyway the zombies will get inside anyway) and buy things as Jugger-nog, Speed coke ect.. Or if we havvnt yet we upgrade our guns.
Mostly we all have 2 upgraded weapons in round 13-14.
This is how we get to 32 and when useing Ray Gun and Zeuscannon only, and i ****ed up because i screwed my Zeus Cannon and we got both no ammo ( we where with 2 players on 3 players mode, some got his ps3 kick him out of the game lol )
So i bought an weapon quickly from the box and started running around again but somewhere i really ****ed up my turing my controller to the right where i shoulda gone straight.. and i got stuck and we died ( he was already dead )
but i think this works aswell while using an MP40 upgraded and just keep running and making big groups start shooting them, and when ure back @ the MP40 room and u badly need ammo just quickly buy it and start running again.
So the best setup is i think:
Raygun and MP40 upgraded (both) (later rounds u badly need Mp40 upgraded otherwise u need 1 mag. to kill 2 zombies)
or
ZeusCannon and MP40 (MP40 upgraded, Zeuscannon is obv already upgraded version)
and spare ure ZeusCannon if u get stuck. Or to blow BIG BIG groups, or when u badly need to revive someone, but then still dont waste all of ure ammo.
SO sorry for hijacking this topic, my point only was that i dont use the alley

and u forgot to put the teleporter on every round, because its pretty usefull imo.