{
  "schema": "front-frame-datum-review-v1",
  "baseline_commit": "b9cdcf85",
  "classification": "New primary-source and native-geometry evidence; no geometry or fitted registration correction applied.",
  "geometry_changed": false,
  "owner_dimensions_applied": false,
  "source": {
    "url": "https://www.spridgetguru.com/AKD4021B/AKD4021BRRa.pdf#page=18",
    "publication": "AKD4021B, SectionR.16, printedR.18, Issue3.65317",
    "pdf_sha256": "74b264212010c9f551e3a5436479d2935cf15c3612ccfbf0621bd3e7611ef25e",
    "model_coverage": "Footer names SpriteMkII/III and MidgetMkI/II. Diagram shows an earlier rear-spring arrangement.1500 applicability is unproven.",
    "warning": "Read directly from original PDF, not search-result OCR. A/B appear as18\u215cin but print465.2mm; D prints37\u00bdin/952.1mm. Those unit pairs disagree. No silently corrected unit or averaged dimension is applied."
  },
  "comparisons": [
    {
      "label": "A\u2013A: front inner-pivot pair",
      "cad_mm": 609.6,
      "earlier_printed_metric_mm": 465.2,
      "earlier_read_inch": 18.375,
      "arithmetic_difference_from_earlier_metric_mm": 144.40000000000003,
      "inch_conversion_mm": 466.72499999999997,
      "printed_unit_disagreement_mm": 1.5249999999999773,
      "classification": "Earlier-model comparison only; not a verified1500 nominal, fitted error or repair dimension."
    },
    {
      "label": "B\u2013B: rear inner-pivot pair",
      "cad_mm": 609.6,
      "earlier_printed_metric_mm": 465.2,
      "earlier_read_inch": 18.375,
      "arithmetic_difference_from_earlier_metric_mm": 144.40000000000003,
      "inch_conversion_mm": 466.72499999999997,
      "printed_unit_disagreement_mm": 1.5249999999999773,
      "classification": "Earlier-model comparison only; not a verified1500 nominal, fitted error or repair dimension."
    },
    {
      "label": "C\u2013C: inside frame side-members",
      "cad_mm": 546.0999999999999,
      "earlier_printed_metric_mm": 279.4,
      "earlier_read_inch": 11,
      "arithmetic_difference_from_earlier_metric_mm": 266.69999999999993,
      "inch_conversion_mm": 279.4,
      "printed_unit_disagreement_mm": 0.0,
      "classification": "Earlier-model comparison only; not a verified1500 nominal, fitted error or repair dimension."
    }
  ],
  "pivot_receiver_native_probes": [
    {
      "side": "left",
      "position": "rear",
      "axis_center_body_mm": [
        304.8,
        228.60000000000002,
        829.7333333333333
      ],
      "receiver_void_mm3": 0.0,
      "adjacent_wall_material_mm3": 0.7181680806106107
    },
    {
      "side": "left",
      "position": "front",
      "axis_center_body_mm": [
        304.8,
        228.60000000000002,
        1202.2666666666667
      ],
      "receiver_void_mm3": 0.0,
      "adjacent_wall_material_mm3": 0.7181680806106108
    },
    {
      "side": "right",
      "position": "rear",
      "axis_center_body_mm": [
        -304.8,
        228.60000000000002,
        829.7333333333333
      ],
      "receiver_void_mm3": 0.0,
      "adjacent_wall_material_mm3": 0.7181680806106113
    },
    {
      "side": "right",
      "position": "front",
      "axis_center_body_mm": [
        -304.8,
        228.60000000000002,
        1202.2666666666667
      ],
      "receiver_void_mm3": 0.0,
      "adjacent_wall_material_mm3": 0.7181680806106113
    }
  ],
  "rail_native_section_checks": [
    {
      "y_body_mm": 254.0,
      "z_body_mm": 338.66666666666674,
      "rail_spans_x_mm": {
        "left": [
          273.04999999999995,
          336.54999999999995
        ],
        "right": [
          -336.55,
          -273.05
        ]
      },
      "inner_face_gap_mm": 546.0999999999999
    },
    {
      "y_body_mm": 254.0,
      "z_body_mm": 592.6666666666666,
      "rail_spans_x_mm": {
        "left": [
          273.04999999999995,
          336.54999999999995
        ],
        "right": [
          -336.55,
          -273.05
        ]
      },
      "inner_face_gap_mm": 546.0999999999999
    },
    {
      "y_body_mm": 254.0,
      "z_body_mm": 931.3333333333335,
      "rail_spans_x_mm": {
        "left": [
          273.04999999999995,
          336.54999999999995
        ],
        "right": [
          -336.55,
          -273.05
        ]
      },
      "inner_face_gap_mm": 546.0999999999999
    }
  ],
  "held_neighbor_sources_sha256": {
    "front-pickup-channel-reference.json": "69a2be63c944602f7fd6aef095d70d7ef4a48d75e11d25cfeb277b9c1a0c45ba",
    "front-pickup-channel-reference.step": "0983c9a24d1171cd80c049e1dceed001551aed91384b1f8371daa9aed1cefddc",
    "wishbone-shell-reference.json": "f6e779efc5ceb29a12f5b8ea85f86a0031bfbbe5cd1c53599763862e4b75bfee",
    "wishbone-shell-reference.step": "28290e83c0400c0f2091834317f656a9d3e4d7b1bdd02f52a278ab5531b88367",
    "front-power-support-reference.json": "6c8f1db5d58c70ee8cf00a526e5c61b27ad79e0e1461baeedb3080cd92428cae",
    "front-power-support-reference.step": "4e0c6754e05c052bbc8598e3724003ed1827d2f08cecf55b251a1dcc288b1f92",
    "front-footwell-reference.json": "b7979dd3923a182e294184e60519594f1249cf0a0352a4746fccd6b6a4dc3e71",
    "front-footwell-reference.step": "8dc22ce429d94e40f16508c9f7b0f863eac45b9979294d736707b8cb0af0c943",
    "steering-rack-reference.json": "807997e9ba4fa293120f1fef45d7b5556545d0298a37148c50beae093d478d0c",
    "steering-rack-reference.step": "2a6583ecc70bd1df08ec990acec6ef18b80d777df81a5130da3b633d0aabdce6"
  },
  "body_register_sha256": "55787bb90fa843e062aa7ba02cb4911a03d321bbd0e215819fddf4cb779d21ed",
  "global_registration": {
    "engine_frame_held": true,
    "body_frame_held": true,
    "wheel_and_suspension_frames_held": true,
    "fitted_engine_body_transform_established": false,
    "reason": "A horizontal width drawing does not establish Y/Z station identity,engine pose,loaded suspension or owner-car datum coordinates."
  },
  "evidence_lookup": {
    "repository_export_found": false,
    "attachment_export_found": false,
    "scope": "Car-related repository/attachment filenames and existing measurement modules/templates reviewed; not a claim about all private files or unsaved browser storage.",
    "existing_owner_datum_path_request_pending": true,
    "existing_manual_path_request_pending": true
  },
  "manual_access": {
    "cover_verified": "Public Teil1 scan title is AKM4071/B;cover says it incorporates earlier manuals includingAKM3267 and covers US/Canada/UK versions.",
    "part1": {
      "url": "https://www.spridgets.de/downloads/Midget%201500%20WH%20Teil%201.pdf",
      "pages": 38,
      "sha256": "91efc51919816489221752f6a8bacd0cea2ee8d00a0be473549f7357d23abe92"
    },
    "part3": {
      "url": "https://www.spridgets.de/downloads/Midget%201500%20WH%20Teil%203.pdf",
      "pages": 35,
      "starts_printed_page": 74,
      "sha256": "ef9fcafbd4e1387439bff02bf75dbc7222403a26374bb93ef3a77ca9aa5e4e66"
    },
    "unavailable_guessed_part_numbers": [
      4,
      5,
      6
    ],
    "unavailable_response": "HTTP403;not evidence that those chapters are absent from the publication. No access control was bypassed.",
    "needed": "Applicable1500horizontal/vertical alignment drawings around printed186\u2013187;original page/point definitions and both unit columns need direct review."
  },
  "rejected_leads": [
    {
      "source": "https://mgcar.fans/kb/mgb/1976-technical-service-bulletins/",
      "item": "76-C-2",
      "reason": "Index explicitly applies to1975/76MGB,not Midget;not used for model dimensions."
    },
    {
      "source": "https://spriteparts.com.au/shop/brochures.html",
      "item": "Sprite/Midget horizontal alignment sheet",
      "reason": "Listing does not establish1500applicability or expose a dimensioned1500original;not purchased or applied."
    }
  ],
  "next_action": "Verify the actual1500drawing/point definitions and resolve unit conflicts before a coordinated change across rails,pickups,wishbones and connected supports. Do not move only the engine or individual brackets to erase overlaps,or reuse this comparison as an owner survey.",
  "limits": "This audit exposes a major unsupported transverse construction;it does not independently prove which current dimension is wrong for the actual car. No diagonals,global scale,Y/Zdatum,repair alignment,loaded clearance,safe support or replacement path is established."
}