EDIT: Oh wait...
You can add something like [cubescript]md3skin * "../barrel/skin.jpg"[/cubescript] to the md3.cfg. For example, if you do this in "models/blabla/md3.cfg", it will load "models/barrel/skin.jpg".
You can add something like [cubescript]md3skin * "../barrel/skin.jpg"[/cubescript] to the md3.cfg. For example, if you do this in "models/blabla/md3.cfg", it will load "models/barrel/skin.jpg".