Just a survival build I made a couple months ago, never got finished because GCat hasn't fixed his Endless Zombies yet, which I really need for this build to be complete.
The premise is that players start inside a cabin, and have to fight successively harder waves of zombies, buying upgrades and weapons with the points they have. Mystery boxes grant random weapons/items (H&K weapon pack + other doodads), while a workbench found behind the cabin offers building upgrades for the cost of resources (collected by killing zombies). All the events are default, and are idiot/cheater-proofed and can't be exploited (except maybe the workbench; I'll have to implement a better idiotproofing system there)
Players can store extra items in backpacks, and are encouraged to save extra weapons/stuff in there to give to teammates when they die and respawn with nothing. Backpack-stored items are saved on death, but anything equipped is lost.
It's not meant to be an "endless" survival, since there's only limited amount of upgrades and stuff to get. I'd probably cap it at 20 or so waves, with really hard waves towards the end.
If anyone wants the build to tinker with, just ask. I'm not doing anything with it anytime soon.
Pictures:
Sorry for the low-res; couldn't use megashot because of players on server.