NIFSkope Worries

[S121]

Okay, I was going to make a modified head mesh by creating the parts in Blender and fusing them with the default head mesh via NifSkope. I've dabbled in fusing armors in Morrowind, but I'm not sure if it would work for head meshes because (A) I understand that armor and head meshes are treated differently, and (B) that Skyrim is NOT Morrowind in terms of creating heads and complex meshes. Simply put, am I able to create a new head mesh by simply fusing them and will it work fine in the CK? What I'm planning is pretty complex and I would hate to spend hours creating a mesh only to scrap it later.