@Soulfather: These are the CS:CZ-levels you can find on many servers already. They also work in CS 1.5, you just need the new hw.dll and sw.dll (if you have problems I can upload them somewhere for you) to see the transparent textures. Download the maps here for example:
http://www.the-last-resort.net/ (Forum>Maptest)
Keep in mind that de_pranesi in CS 1.6 is different from 1.5 (layout).
Have FUN!