I think you misjudge the portal community and its interest in this sort of thing. You're making some mainstream gaming news sites with it (like shacknews). It's excellent work - with I had the skills to pull this off!
I actually find this process that you have documented quite interesting. I'm sorry not to many people have responded or viewed your wonderful work. I haven't played the game 'Portal', but I love the look of what you have done here. If you want to start a thread or post here in your costume section how you have done this in more detail I would be more than happy to read about it. Good luck to you and here is to reading more.