Well guys, I've released the "source code" fron de_mon, you can make quite anything with it, even port it to other mods or games or even dimentions.. well, who knows
http://www.labs.leveldesign.com.br/mapas/half-life/cs/de_mon/de_mon_map.rar
Make sure to read the readme.txt included with it! I've included a lot of other things too, wich I think will be helpfull!
Have fun