{
  "project": "sambuca",
  "title": "Sambuca — Modern Boat-Shaped Arched Harp Inspired by the Royal Cemetery of Ur",
  "build_target": "SAM-13-ROOT",
  "family_members": [
    "SAM-13-ROOT",
    "SAM-19-MID",
    "SAM-25-CONCERT",
    "SAM-13-AE",
    "SAM-13-MULE"
  ],
  "capstone_window": "Fall 2026 (~October–November)",
  "release_status": "private-review",
  "release_gates": [
    "Cultural / musicology advisor review (R-C-01 / V-C-01)",
    "SAM-13-MULE neck-deflection 30-day hold (R-S-01 / V-S-01)",
    "Heifer Zephyr brand integration option locked (V-B-01)"
  ],
  "license": {
    "design_files": "CERN-OHL-W-2.0",
    "written_content_and_media": "CC-BY-4.0",
    "rationale": "Dual-license. Hardware design (cad/, drawings/, cnc/, BOM and family-spec CSVs) under CERN-OHL-W-2.0 (Weakly Reciprocal) for explicit patent provisions and copyleft on design derivatives. Written content and media (md docs, capstone deck, print packet, photos, site) under CC-BY-4.0 to match the Heifer Zephyr workshop precedent and maximize discoverability."
  },
  "packet_version": "v4 (instrument-maker-v4 skill)",
  "packet_generation_date": "2026-05-16",
  "primary_author": {
    "name": "Tony Koop",
    "workshop": "Heifer Zephyr",
    "email": "tonykoop@gmail.com"
  },
  "artifacts": {
    "design_foundation": [
      "README.md",
      "reverse-engineering.md",
      "design.md",
      "family-spec.csv",
      "risks.md"
    ],
    "tables": [
      "bom.csv",
      "sourcing.csv",
      "cut-list.csv",
      "validation.csv"
    ],
    "process_docs": [
      "assembly-manual.md",
      "supplier-rfq.md",
      "drawing-brief.md",
      "visual-bom-brief.md",
      "photo-shotlist.md"
    ],
    "engineering": {
      "cad": {
        "source_of_truth": "cad/SAM-000_master-equations.txt",
        "migration": "cad/SW-MIGRATION-CHECKLIST.md",
        "operational_notes": "cad/README.md",
        "pack_and_go_parts": [
          "cad/SAM-000_MasterLayout.SLDPRT",
          "cad/SAM-000_SAMBUCA.SLDASM"
        ]
      },
      "drawings": {
        "brief": "drawing-brief.md",
        "placeholder_index": "drawings/README.md",
        "status": "SVGs deferred until SolidWorks MasterLayout rebuild completes"
      },
      "cnc": {
        "plan": "cnc/cnc-plan.md",
        "status": "pre-CAM operation plan; G-code generated by CAM software downstream"
      },
      "wolfram": {
        "notebook": "wolfram/sambuca-acoustics-starter.wl",
        "extensions_added_this_packet": [
          "Soundboard plate-mode estimator (Section 8)",
          "Combined cavity × plate coupled response (Section 9)",
          "Voiced-range plot per family variant (Section 10)",
          "Sensitivity analysis (Section 11)"
        ]
      }
    },
    "capstone": {
      "outline": "capstone-deck.md",
      "deck": "capstone-deck.pptx",
      "manifest": "capstone-manifest.json"
    },
    "print_packet": {
      "outline": "print-packet.md",
      "html": "print-packet.html",
      "pdf": "print-packet.pdf"
    },
    "site": {
      "entry": "site/index.html",
      "status": "private-review banner; pulls images from images/ when populated"
    },
    "learn_to_play": {
      "folder": "learn-to-play/",
      "status": "placeholder; downstream sheet-music skill populates after tuning is locked on MULE"
    },
    "harness": {
      "folder": "harness/",
      "files": ["harness/README.md"],
      "status": "design notes for SAM-19-MID and SAM-25-CONCERT harnesses"
    }
  },
  "physical_design_anchors": {
    "body_length_mm_SAM_13_ROOT": 650,
    "body_width_mm_SAM_13_ROOT": 150,
    "body_depth_mm_SAM_13_ROOT": 150,
    "instrument_height_mm_SAM_13_ROOT": 810,
    "string_count_SAM_13_ROOT": 13,
    "tuning_SAM_13_ROOT": "G-major, G3 → E5 (A-major retune documented in supplier-rfq.md)",
    "target_total_tension_kgf_SAM_13_ROOT": "65–80 (calibrated)",
    "wood_pairing_SAM_13_ROOT": "Walnut hull / Western red cedar soundboard / Sapele neck",
    "string_termination": "Glued-on string-holder strip near bow end of soundboard (no separate bridge bar)",
    "soundhole": "Single oval keel port, 80 × 50 mm, forward-tilt 15°",
    "playing_position": "Seated, long axis between thighs, neck rises away from torso, both hands symmetric"
  },
  "cultural_provenance": {
    "pattern": "Sumerian, Royal Cemetery at Ur, c. 2600 BC",
    "claim": "Inspired-by — not a reproduction, not a recreation of any specific reconstructed instrument, not a claim of cultural authority over any modern living tradition",
    "sambyke_etymology": "Historically contested; build acknowledges the link without claiming it",
    "public_domain_status": "~4500 years; unambiguously public domain",
    "reference_artifact": "British Museum object 121198 (b/c), Royal Cemetery at Ur",
    "reference_cylinder_seal": "Penn Museum object 47880 / B16728 (Pu-abi's tomb, PG 800B)"
  },
  "sources": [
    {
      "title": "BM 121198 display card and gallery photos",
      "credit": "© Trustees of the British Museum, CC BY-NC-SA 4.0; photo Don Hitchcock, 2015"
    },
    {
      "title": "BM 121198 second photo set",
      "credit": "Tony Koop direct upload, 2026-05-16"
    },
    {
      "title": "Herbology Manchester profile photo of BM 121198",
      "credit": "Herbology Manchester, 2015 (used with permission)"
    },
    {
      "title": "Royal Cemetery cylinder seal B16728",
      "credit": "Penn Museum / University of Pennsylvania, object 47880",
      "url": "https://www.penn.museum/collections/object/47880"
    },
    {
      "title": "Woolley, C. L. (1934). Ur Excavations, Vol. II: The Royal Cemetery",
      "credit": "British Museum / University of Pennsylvania Museum joint publication"
    },
    {
      "title": "Kora MasterLayout parametric template",
      "credit": "Tony Koop, prior work, C:\\Users\\Tony\\Documents\\GitHub\\kora"
    }
  ]
}