i have post it before and i will post it again just for case.you can add two diferrent orc basic unit (one with choppas and one with spears)and you can upgrade them later to "Big'Uns"(with better armour,skill,strenght,defence,etc.)(both of them).mind an upgrade(or different unit)for arrer boyz that could be orcs with crossbows(there are mercenery warbands of orcs with crossbows,you can also include them to the army except only as mercenery in the world map,it think that they have a famous boss but i don't remember him,i will look for it soon)also the goblins might have an upgrade.the basic goblin unit can be upgaded to night goblin(and also the archers)with better skill.to finish,a good suggestion is to have goblin leaders that some of the might be night goblin leaders and will have the night fighter trait(and only them). i forgot that the goblins(basic and nihgt goblins)also have two weapons,the sword(or stick like similar to billhock)and the spear.