sp_a4_final3 // Chapter 9, Third Map.
After downloading the game and spending hours finding the perfect map....here it is.
I've taken some screenshots to give you an idea of generally where the humans should cade, the location of the zombie spawn, and such and such. The rest of it is up to you, either to add rooms or other stuff. @Train
(The map should have an invisible barricade at the part where the wall breaks off and shows you a big facility.)
https://imgur.com/a/s02cN1G(Another way of accessing the screenshots.)