Anyway, here you go

EDIT: Hey MR.ROCKET, Long time no see..
http://rapidshare.de/files/8957992/cl-i ... o.zip.html
This demo wad is loosely base on UT2004's Invasion game mode, which includes 2 waves of monsters.
Screenshots:
http://i12.photobucket.com/albums/a236/ ... f76c86.png
http://i12.photobucket.com/albums/a236/ ... 660432.png
http://i12.photobucket.com/albums/a236/ ... 54fca1.png