Counter Strike: Source models not being loaded in my custom Garry's Mod config

This is probably a really dumb question, and I’m probably doing something really stupid, but it is bugging the shit out of me right now. I have the Counter Strike: Source FGD loaded into my custom Garry’s Mod config but I can’t seem to load the models from CSS in. If someone can help me, please do.

An FGD is merely an entity reference for Hammer.

Use GCFScape to extract CS:S content to the proper GMod directories.

Argh, I really have to do that? Okay.

Thanks for the help!