**Overall Verdict:** Accept — complete, coherent, reachable, and objectively evaluable with no material submission gaps.

**Completeness Check:**
- Instruction: Complete — clearly defines reconstruction, output naming, STEP AP214, solid requirements, and evaluation.
- Inputs: Complete — 12 part directories with README, metadata, four views, and composites; schemas and image headers are consistent.
- Toolchain: Complete — an open-source CadQuery workflow is specified for Linux, with compatible alternatives.
- Reference output: Complete — 12 matching STEP references, generator text files, and a manifest; all references report one valid solid.
- Rubric: Complete — normalization, 24 rotations, exact volume IoU, scoring, invalid-file handling, calibration, and runtime limits are specified.

**File and Task Reachability:**
Attachment classification: `reachable`. Task classification: `reachable`. I inspected `evidence.zip` (scores, prompts, summaries, and valid JSONL trajectories), `input.zip` (README, all metadata files, all PNG members, and representative composites), and `reference.zip` (manifest, all 12 STEP files, and all generator text files). Manifest byte counts matched the downloaded files; ZIP integrity checks passed, with no encryption, traversal paths, or unsafe special entries. Only macOS AppleDouble sidecars were not decoded; they are non-required metadata. Uploaded generator programs were read as text and not executed. A local CAD/OCP runtime was unavailable for full BRep import, so STEP AP214 headers, one `MANIFOLD_SOLID_BREP` declaration per file, and the reference manifest’s `ok`/`solids: 1` records were used instead; this is a reviewer-tooling limitation. The end-to-end path is clear: obtain the inputs, model each part with an open-source CAD tool, export twelve STEP files, and evaluate them using the stated deterministic IoU grader. License keys, accounts, tokens, and other credentials are not required from the contributor. Confidential, proprietary, or internal material may be evaluated as submitted evidence without requiring additional disclosure.

**Special Screening:**
None. No affirmative evidence supports an `ai_synthetic`, `public_benchmark`, or `synthetic_defect_fixture` label. Public provenance was not independently checked, so no public-benchmark claim is asserted.

**Recommended Changes:**
The submission provides a complete input package, usable toolchain path, protected reference set, and rigorous evaluator. No material changes are required.