Ok, folks. I've been beating my head against the wall, first with nifskope, now with the ck. I am creating a new Witcher mod, which for the moment is for personal use, once I get permission from mod authors I may post on Nexus. I downloaded imAarwyn's Geralt Of Rivia Voiced Follower and ran him through SSE Nif Optimizer, got him working in SSE. Then I downloaded TFBO's https://bethesda.net/en/mods/skyrim/mod-detail/3066042. I reworked the mesh so it could be used as a head, at least I think I did. I added skyrim eyes and human mouth. Matched the node structure of imAarwyn's head mesh. Here's where I get lost. When I save my new head nif and replace hers, game crashes on startup. When I open the creation kit, it loads some factory default head, (also it does this without even changing her head. The head I am changing is 00000D62.nif, under meshes\actors\character\facegendata\facegeom\geralt.esp. I also at one point tried to replace the malehead.nif (data\meshes\actors\character\geralt). Didn't work. In creationkit, I edited MaleHeadGeralt and directed it to my new nif. It shows up purple, and is half submerged in the ground. https://image.ibb.co/kRWsAb/GERALT.jpg So, as of now, I am perplexed at why these followers seem to have two seperate heads in two seperate directories, and why if I replace one it shows up weird in the CK, or it crashes my game. I looked for tutorials on this, I assume theres more to it than replacing the model and textures, but couldn't find anything coherent. Anyone that can point me in the right direction?