Reign of Kings Items only with permissions

I want to make it so that certain items in the game are only craftable by certain permission groups. For example, permission group A can make iron weapons, but are unable to make steel weapons, it would be greyed out or say unavailable or something. Group B can make iron and steel. Group C can only make steel. I would want to customize all of the armor and weapons from wood to steel for each group.

 

With the current hooks and permissions available this is not possible.
The game has no build-in permissions for this and to do it by plugin you would need a hook that would get triggered when a player tries to craft something and them make the plugin check if the player may craft that item. Though, this hook does not excist yet.