Slaughterhouse mod for Left 4 Dead

Slaughterhouse is a campaign for Left 4 Dead, maybe it's the first one with a different concept, that instead of running away from the infection, it throws the player directly to it's source.
The campaign it's on it's making and it won't be complete so soon, I'm doing it all by myself, so feedback and tips are always welcome.

Some Features I want* to add:
-There will be traps that if possible will be randomly moved by the AI Director to improve gameplay tactics
-Not so fun Easter Eggs.
-Limited Resources: There won't be lots of weapons on this campaign, forcing the players to use what they have (Health kits, ammo, grenades) wisely.
-"Death run" level(s): Using triggers and buttons, the players will be forced to run away from HORDES of tanks while activating buttons to make them slow down.
-Alternate Endings: Secret Hidden Checkpoint rooms that can lead to shortcuts or other Finales
-Custom Textures** and climatic story: Fight your way to the source of the infection and destroy it, find out who and why it was created.
-Scary Environment: By actually putting the player on a abandoned underground Slaughterhouse, there won't be where to run, there won't be light, there won't be guns, only blood thirsty zombies wanting to rip the fuck out of your face.

*: Probably not everything will be included
**: I don't fucking know how to add new textures.

I am also planning to change both images showcasing the game (Mod Header and Profile images), I'm trying to make the poster.