I would like to suggest Guild Tags in the game to show a persons permissions/rank through the color of their guild tag on their name.
In the Guild Books, each permission has a color associated with it. Build Permissions are Purple, Executive is Bronze, Director is Gold.
I think there needs to be a quick and visual way for a players rank in a guild to be seen, that way people can visually know who they can go to for help or issues in their/that guild.