This tutorial shows you how to setup Hammer for PVK2. Hammer is a level editor used for Source Engine based games, and the setup for PVK2 is a bit different.
This tutorial also goes over setting up Hammer so you can view PVK2's player models that may appear invisible due to its custom shaders.
EXTRA NOTE: When you first start Hammer, it may start in plain wireframe mode. You can change this by clicking on the "camera" text in the uppper left viewport and changing it to how you want.
SECOND EXTRA NOTE:
I forgot to do this in the video, but set your cordon texture to "tools/toolsskybox" without the quotes.