[
 {
  "command": "solid.box",
  "params": {
   "length": 40,
   "width": 30,
   "height": 20,
   "corner": [
    0,
    0,
    0
   ],
   "body_name": "Case"
  }
 },
 {
  "command": "solid.shell",
  "params": {
   "faces": [
    [
     20,
     15,
     20
    ]
   ],
   "thickness": 2,
   "direction": "inside",
   "body": "Case"
  }
 },
 {
  "command": "solid.cylinder",
  "params": {
   "diameter": 6,
   "height": 5,
   "base": [
    8,
    8,
    2
   ],
   "operation": "join",
   "targets": [
    "Case"
   ]
  }
 }
]