Technic-Server-1.20.1/overrides/resourcepacks/CABIN/assets/cabin/models/block/enderium_casing.json

{
  "parent": "minecraft:block/cube_bottom_top",
  "textures": {
    "top": "cabin:block/enderium_casing_top",
    "bottom": "cabin:block/enderium_casing_top",
    "side": "cabin:block/enderium_casing"
  }
}