{
  "schema": "front-frame-validation-v1",
  "baseline_commit": "93ca06b8",
  "scope": "Owner IMG6914/6919 and firsthand BMH assembly photographs support a formed crossmember, sloping broad face, visible apertures and connected frame architecture, not dimensions or hole identity. Existing width/height/extents guide the new section; front-web slope,8mm outer corner radius, saddle-mouth forward limit, hole row/axes and projected2.54mm wall remain estimates. The three former bottom-web openings are superseded by the front-face comparison. Continuous rails retain old external step/envelope and forward pickup geometry while removing overlapping-box internal walls. The remaining longitudinal rail curve, factory seams/laps, reinforcements, pressed section, corrosion/repair history and common fitted frame remain unresolved. No suspension, steering, spring, damper, engine or wheel datum moves. Native source joins/openings do not establish loaded strength, alignment, clearances, jacking/support points, repair dimensions or verified removal paths.",
  "source_groups": 15,
  "valid_positive_step_solids": 31,
  "unchanged_mesh_payloads": 12,
  "rail_checks": {
    "left": {
      "connected_rail_solid": true,
      "outer_bounds_retained": true,
      "forward_rail_material_unchanged": true,
      "longitudinal_cavity_open": true
    },
    "right": {
      "connected_rail_solid": true,
      "outer_bounds_retained": true,
      "forward_rail_material_unchanged": true,
      "longitudinal_cavity_open": true
    }
  },
  "three_front_face_apertures_with_adjacent_material": true,
  "former_bottom_apertures_retired": true,
  "rear_upper_saddle_open": true,
  "rail_crossmember_source_joins_mm3": {
    "left": {
      "before": 5058.140421333673,
      "after": 4943.0020109569405
    },
    "right": {
      "before": 5058.140421333682,
      "after": 4943.002010956995
    }
  },
  "selected_exported_engine_crossmember_contacts_mm3": {
    "crank_pulley_nut_155357_catalog_photo_provisional": {
      "before": 0.0,
      "after": 0.0
    },
    "sump_provisional_casting": {
      "before": 0.0,
      "after": 0.0
    },
    "sump_gasket_GEG517_catalog_reference_provisional": {
      "before": 0.0,
      "after": 0.0
    },
    "sump_twelve_MA805_screws_catalog_reference_provisional": {
      "before": 0.0,
      "after": 0.0
    },
    "sump_four_HU805_screws_catalog_reference_provisional": {
      "before": 0.0,
      "after": 0.0
    },
    "sump_drain_plug_114774_catalog_reference_provisional": {
      "before": 0.0,
      "after": 0.0
    },
    "crank_pulley_seal_comparison_provisional": {
      "before": 0.0,
      "after": 0.0
    }
  },
  "selected_engine_contact_scope": "Current engine STEP sump/pulley names only at retained source transform; not a full-car or fitted clearance audit.",
  "engine_to_body_translation_mm": [
    0.0,
    555.2,
    715.9000000000001
  ],
  "sha256": {
    "front-structure-reference.json": "83c9a8bc573e04e00e74b4a0707b7b7cdb5ab1c4fd3a44a5fdc378b65b7b747a",
    "front-structure-reference.step": "e721eb55fafbbf4ac4257e8e2946e41e5a2d4cc91b5b283d4d97d9dd371b710f",
    "midget-1500-measured-core.step": "05849788af49defc430885ffedac66589fea076e2c7581197aff29780fed0a39"
  }
}