This is a map I made for Counter-Strike:Source in 2009 using Source SDK. This was one of the more detailed and comprehensive maps I made and the only one which I distributed to game servers for others to play publicly. A few servers did include this in their rotations and I was fortunate to receive a lot of positive feedback.
The video at the bottom is fairly lengthy (~10min) and includes a flyover and a walkthrough.  It’s long, but at the same time, I feel it’s really the only way to understand how it all comes together, and to show off all the details.