Heros Forge is working on NPCs, but I think they need a normal texture set to 1 or more as well as the Herosforgemodel field to display. I have most of the Guild Masters in PoK with Heros Forge models, and all are displaying correctly. 
 
Note also that the Herosforgemodel values jump around a bit, I think they start at 50. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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