How do you make it so you cannot walk through a model like statue, desk, etc.? I also just wan't to say thanks to GroBadmiral and Kouen for putting up with me. (Please tell me I spelled those right :D)
Use brushes made from the physics_clip texture, which you can find in the system folder. Place brushes over the model, then manipulate them through various means until they're roughly the shape of the model.
There is another way, you can merely set the spawnflags to 2, but that causes problems, so I really wouldn't advise using that second method.
I don't know how, and I don't know why, but this is totally Sheep's fault.
Thanks again Kouen!