{
  "representation": "independent mechanical alternatives; number of marks is illustrative, not specified sensing design",
  "alternatives": [
    {
      "id": "side-entry",
      "shell_openings": "separate opening for each represented component",
      "internal_positions": "two different illustrative elevations",
      "withdrawal": "each component along its inclined insertion axis",
      "work_interfaces": [
        "individual release",
        "local platform/handling",
        "piping and steel clearance"
      ]
    },
    {
      "id": "top-entry",
      "shell_openings": "one selected top entry for represented assembly",
      "internal_positions": "four illustrative distinct elevations on same assembly",
      "withdrawal": "overhead extraction of full long assembly",
      "entry_alternatives": [
        "dedicated top nozzle",
        "maintenance access when selected construction permits"
      ]
    }
  ],
  "conditions": [
    "bed/support and internal assembly fit",
    "actual nozzle and shell/insulation dimensions",
    "release/handling/lifting",
    "component material and pressure-boundary design"
  ],
  "excluded": [
    "control/signal architecture",
    "measurement uniformity or performance",
    "generic X length",
    "stress/vibration acceptance"
  ]
}