[
  {
    "type": "pcb_board",
    "pcb_board_id": "LEFT_PCB",
    "subcircuit_id": "left",
    "width": 10,
    "height": 6,
    "thickness": 1.6,
    "center": { "x": -15, "y": 0 }
  },
  {
    "type": "pcb_board",
    "pcb_board_id": "RIGHT_PCB",
    "subcircuit_id": "right",
    "width": 8,
    "height": 4,
    "thickness": 2,
    "center": { "x": 15, "y": 0 }
  }
]