[
  {
    "input": { "concrete": 500, "iron_plate": 250, "iron_rod": 400, "wire": 1500 },
    "output": { "space_elevator": 1 },
    "machine": "_placement",
    "power_usage": null,
    "size": [ 54, 54, 118 ],
    "requires": "hub_upgrade_5"
  }
]