Since you didn't answer my e-mail, I'm writing it into the forum: I'm a really big fan of Portal TFV. I know, that you get lots of demands on making a level editor for this and I know (well, I can only guess) that this is a lot of work for you. But as you can see, so many people want this and it would be really, really awesome to play self-made Portal TFV levels. The most awesome way would be (like someone already has posted in the forum) the same way as in N (http://en.wikipedia.org/wiki/N-Game). - After making a level you get a code, which you can put in the userlevels.txt, and so the level is available via the menu. So I beg you, please, please make a level editor - you would make a lot of fans very happy. And me too.