Base builder zombie mod is an idea that totally warps the idea of a Half-Life zombie mod. If you're familiar with Counter-Strike Source zombie mods, then you are also aware of the physics which allows the user to essentially build his/her own barricade using couches and other objects laying around. Using this concept, I thought of moving this idea a step further and allow the user to create their own entire bases. After all, everyone likes to make their own maps. So why not let them...