Topic: Source SDK Prefabs

NOTE: I'm not quite sure if this is against forum rules (nothing mentions anything related to legal modding), so if I have broken any I deeply apologize for my behavior.

I've been getting into Source SDK (more specifically the Hammer editor), Valve's free and legal source engine editor. I've been using it for Portal custom mapping for a good while, but whenever I try to make something semi-professional, I always run into one problem; the making of the puzzle elements of Portal. These take a good 3-6 hours just to make something simple like a Aperture Science Super Colliding Super Button open a Aperture Science Door (God, do I love Portal Terminology. ). Because of this, I have looked for "prefabs", which are essentially the already made versions of the objects in the game ready to be used in the Hammer editor. I have found some prefabs, but they either don't have many of the already made objects I want or they are on sketchy sites such as "FPS Banana". I'm wondering if any of you know sites or specific links that have already made prefabs for Portal that have a good amount of objects. So, do you?

EDIT: Forgot to say that it's not illegal to distribute prefabs over the internet.

#1. It's named "FPS Banana".

#2. I've read some things that state that some people have gotten viruses after downloading what appeared to be harmless files. Not sure if it's true, but I like to stay on the safe side of things.

EDIT: Changed "many" to "some".