{
  "version": 1,
  "model": "Lenovo GB300 NVL72 reference reconstruction",
  "authorship": "Independent procedural geometry; no NVIDIA DSX evaluation geometry or third-party photo textures",
  "units": "metres",
  "dimensions": {"rack": [0.6, 2.236, 1.068], "tray": [0.438, 0.0436, 0.766]},
  "configuration": {"rackCount": 528, "computeRacks": 504, "supportRacks": 24, "inspectableTrays": 1, "specimen": "C01-GB300-01", "computeTraysPerRack": 18, "nvlinkSwitchTraysPerRack": 9, "powerShelvesPerRack": 6, "cpuPerTray": 2, "gpuPerTray": 4, "gpu": "B300 SXM7", "gpuMemoryGB": 288, "fanPerTray": 8},
  "verified": ["Tray and rack body dimensions", "2 Grace CPUs and 4 B300 GPUs per compute tray", "18 compute trays and 9 NVLink switch trays per NVL72 rack", "6 power shelves is one supported configuration", "Each B300 uses two compute dies and HBM3e"],
  "estimated": ["Component positions, coldplate and hose shapes, connector and fastener dimensions from public drawings", "GPU package dimensions and HBM external packaging"],
  "illustrative": ["528-slot room placement and building are independent reference arrangements, not NVIDIA as-built documentation", "24 auxiliary cabinet exteriors represent network, storage and coolant distribution; no certified engineering capacities", "GPU package separation is illustrative, not a physical silicon layout or maintenance procedure"],
  "unknown": ["Exact internal multilayer PCB routing and transistor layout", "HBM die stack geometry; no claim of individual DRAM layers", "Detailed site power and cooling engineering; no construction accuracy claim"],
  "sources": [
    "https://lenovopress.lenovo.com/lp2357-lenovo-nvidia-gb300-nvl72-rack-scale-ai",
    "https://pubs.lenovo.com/gb300-nvl72/gb300-nvl72_hardware_maintenance_guide.pdf",
    "https://developer.nvidia.com/blog/inside-nvidia-blackwell-ultra-the-chip-powering-the-ai-factory-era/"
  ],
  "legacy": "interior-*.glb and interior-manifest.json are the previous H100 illustration, retained separately and never used to represent GB300"
}