plans: [
  {
    unit: risso
    time: 2400
    requirements: [
      copper/40
      graphite/30
      metaglass/60
    ]
  }
  {
    unit: retusa
    time: 1800
    requirements: [
      lead/30
      silicon/30
      metaglass/30
    ]
  }
]
requirements: [
  copper/250
  graphite/100
  metaglass/50
]