See it here:
viewtopic.php?f=5&t=12091
Hope it works well, there are no noticeably bugs so far. But I had quite a fight with some semisolid brushes. So it might not be that stable.
The stairs of BSP hell
![Image](http://i1108.photobucket.com/albums/h413/makemeunreal/shot01_zpswvpq4ewi.png)
"Labyrinth"
![Image](http://i1108.photobucket.com/albums/h413/makemeunreal/shot02_zpsigdooljd.png)
"Red Base"
![Image](http://i1108.photobucket.com/albums/h413/makemeunreal/shot03_zpsvl45tcmr.png)
Download it here:
https://www.dropbox.com/s/7acs3jfq4w1d2 ... t.rar?dl=0