Modelfiles:
*.m2
*.skin(<--these we'll have to edit)
*.anim
Tools to use:
Hexeditor of your choice
Every Skin-file contains a number of Submeshes which describe the Geometry of some parts of a model in WoW.
The Count and the Offset you can find in the Header of the Skinfile
The architecture of such a submesh you can find here.
So if you null out the vertices and triangles you tell WoW that there isn't data in these geosets and it will not render anything.
How to find out which submesh to null out?
Try it!
Why messy?
Cause you don't delete the submesh and fix the file, so you have the datablock still in your file.
With this methode I created ie a gryphon without wings: