One of my developers (BoxFigs) is creating a mod called "Portal: Zero Point Energy".
You can check out his page here: Moddb.com
The mod is has you in test chambers but with the gravity gun (with the portalgun) all sticking to Portal's level design. I am a playtester for this mod (and I have done a little texture work too). More information can be found on his page.
Moddb.com
So please check out his mod, he knows what he is doing and I recommend you follow this mod for future updates and more. Thank you.
