This video roughly explains how to use Propper to turn brushes from hammer into props.
If you are using a different game from gmod, it should auto generate and compile your model for you.
Propper: https://github.com/tuxxi/propper-2013...
Propper Parameters: -game $gamedir $path\$file
Crowbar: https://steamcommunity.com/groups/Cro...
Gcfscape: https://web.archive.org/web/201910030...
Hammer Editor Discord Group: / discord
Interlopers: (not mentioned in video, used to check your compile log for errors, very handy) https://www.interlopers.net/errors/
Support me on Ko-Fi:
https://ko-fi.com/alexscott20