On a weekend, I started experimenting with Valve Hammer Editor. Hammer is used to make maps for games like Half-Life, Counter-Strike, Quake and some others based on same engine. I worked on this for 4 days without a break!
I am also uploading Source file, if anyone thinks he can improve on it. (See Technical Page)

Without anymore talking, Here is a basic map of Fast Karachi. I consider it incomplete as it has CS and Telecom Buildings and Corridors of CS Building.

Instructions:
Download and extract the files to your counter strike folder (e.g: "C:\cs1.6\").
Or manually copy the de_campus_bb.bsp to "cstrike\maps\" folder and fast.wad to "\cstrike\" folder.

Then just run CS and create a new game with "de_Campus_bb" as the map. Enjoy!
P.S. I AM NOT RESPONSIBLE FOR ANY ILLEGAL USE OF THIS MAP BY ANYONE! I MADE IT JUST FOR FUN AND DID NOT, IN ANY WAY TRY TO INSULT OR CAUSE TROUBLE FOR FAST.