hey, this looks interesting so i have looked at it
First,
have you made it?
Then some issues that needs fixing:
3 pipes in a row is _waaay_ too OP(over powered) for CT, zombies will not have a chance.
At this place i got stuck, i could not get out. Add a box or something so ppl can get out. or just change something.
As you can see, all this containers is very OP(overpowered) if CT stand on each others heads and jump up. stopping the zombies from getting up is too easy. Try add some way for 1 person to be able to get up there, like a box (64x64x64 should do it).
Im not sure, but this could be too OP too.
Same point as before, those boxes will get moved or destoyed and its too OP again.
Other than that the maps looks very nice and if these problems are adressed i would love to have another look at it again^^
PS; make sure to optimize the map, if you have not already.