The custom content for the map can be found here! [drive.google.com]

I recommend using Hammer++. [ficool2.github.io] Some editor notes won't be visible if you're not.

If you're creating custom models using blender, I recommend using SourceOps [github.com] by bonjorno7. Fantastic tool!

Feel free to use these assets to your heart's content!
Happy mapping! :)