And well, Portal, being made by Valve, available on Steam? It just kind of needed to be done.
By the way, I've finished Portal 2, but please refrain from spoilers in the comments as others may not yet have done so.
Also in my Steampunk Portal themed series:
The Gentlemanly Escort Cube
The Wheatley Dumbwaiter Service
Time: About 7 hours
Tools: Photoshop CS4, Wacom Intuos tablet, cgtextures
The colors, shading, and overall everything is great!
this is freaking awesome good work (: