I'm trying to make ground meshes for the helmets in Dwarven Devious Cuirass. I've attached one of them here. (The author has given all  permissions.)   DwarvenDD_helm_1.nif   Following this guide (and a few other ones I watched...), I extracted the ground model for a daedric helmet from Skyrim's BSAs, and copy/pasted the DwarvenHelmetOpen BSTriShape onto to the ground object's helmetGO:0 BSTriShape. (I can't find a "NiTriShapeData / Data line" in the ground object's mesh, and