I'm working on a L4D survival map that will consist of a summer house on the top of a hill, with a tall brick wall surrounding the hill leading to a closed off gate. The zombies will always spawn from the other sides of the walls, forcing the survivors to result to staying in the two story house.
So far, I've been working on the house itself in Google Sketchup, and now I just have to wait for the L4D sdk to finish so I can export it to hammer.
Tell me if I can improve anything on the house itself. And yes, props such as furniture, doors, glass, and a ladder leading to the attic will be added in hammer, so I just need advice on the layout of the house.