Almost every FNaF map uses CSS textures for the floors and walls.
To avoid the dreaded "purple and black" missing texture errors, most of these maps require assets from other games. fnaf+1+map+gmod+link
If you want the "OG" experience that many early GMod YouTubers used, this is likely it. It focuses on atmosphere and accuracy. Almost every FNaF map uses CSS textures for
This is widely considered the gold standard for GMod FNaF maps. It isn't just a static building; it’s a fully functional game. It includes an Events system where you can trigger nights 1 through 7, a working power system, and moving animatronics that track you. a working power system