{"corpus": {"categories": ["sweepable", "thin-wall"], "volume_mm3": 61600},
 "commands": [
  {"command": "sketch.create", "params": {"plane": "XY", "name": "Section"}},
  {"command": "sketch.line", "params": {"points": [[-20, 0], [20, 0], [20, 3], [1, 3], [1, 37], [20, 37], [20, 40], [-20, 40], [-20, 37], [-1, 37], [-1, 3], [-20, 3]], "closed": true}},
  {"command": "sketch.finish", "params": {}},
  {"command": "solid.extrude", "params": {"distance": 200, "body_name": "Beam"}}
 ]}