Problem creating custom head meshes for NPC's using ECE

[Connectamabob]

I've been trying to create custom heads for some mod-related NPC's Using ECE and CharGen Export:

http://www.nexusmods.com/skyrim/mods/61336/?

 

I've created the NPCs, and sucessfully created custom head NIFs using CharGen Export, however I can't find clear info on how to actually apply the head nif to the npc.

 

I posted the question in CharGen Export's thread, but have gotten no replies (I guess that thread isn't viewed often). I read through the whole thread, but only got vauge info that way. I get that you're supposed to swap the CharGen Export nif for an existing niff stored in the data folder, but it's not 100% clear which or where.

 

It looked like they meant to replace the nifs in data/meshes/actors/character/facegendata that are created when you export an NPC's face data from the CK using ctrl+F4, but when I replaced those with the custom nifs (w/ the custom nifs renamed to match the original chargen exported nifs), my NPCs render in-game with the same mismatched default head you get if you don't do a ctrl+F4 export in the first place.

 

There's also hints that you have to edit a few lines in NifScope, but no indications of what lines or edit how.

 

Any help would be greatly appreciated.