I looked into this website, and they do pre fabrication and stuff. They have this model, and it looks like they designed it in a way where they split the walls in certain componets so they can build it offsite.
Does anyone know if they use threejs, and if they are, does anyone know how they split the walls into fragments for pre fabrication designs?
You can create a separate model parts / prefab components in Blender - and then connect it in three.js, building complete structures out of multiple Meshes (if the prefabs would use the same material, you can also use InstancedMeshes in such case.)