{
  "type": "siegemachines:siege_workbench",
  "pattern": [
    "p"
  ],
  "key": {
    "p": {
      "tag": "minecraft:planks",
      "count": 2
    }
  },
  "result": {
    "item": "siegemachines:beam",
    "count": 4
  }
}