{
  "id": "gearbox_housing_split",
  "level": "hard",
  "family": "mechanical_fixture",
  "prompt": "Design a compact split gearbox housing concept as editable CadQuery. Include two bearing bores, bolted flanges, ribbing, a removable cover seam, oil drain boss, and rounded exterior edges.",
  "image_prompt": "Realistic CAD render of a compact split gearbox housing with bearing bores, bolted flanges, ribs, cover seam, and oil drain boss, plain white background, no text.",
  "semantic_hints": [
    "gearbox_housing",
    "bearing_bore",
    "bolted_flange",
    "rib",
    "cover_seam",
    "oil_drain_boss",
    "rounded_edge"
  ],
  "bbox_mm": [
    260,
    180,
    160
  ]
}