sAvenFor the 6.11.1 version, would putting my custom class configs into tf / custom / my_custom_stuff / cfg / user work the same way as just putting them in tf / cfg / user?
Yes, the SteamPipe system shares the file structure with the main tf/ folder. However, I'd like to recommend using either tf/cfg or packing your custom folder into a VPK (if your custom files are supported for the VPK format) for faster load times.