Problems with nested JSON Sencha Architect

I can't figure out which is the root porperty and the correct models for the store for this JSON code I'm attaching below.

Please, could someone help me? I have worked with JSON before in Architect but never with something that complex.

Thanks!

Code:

{
  "INTERFASE": {
    "PARAMETROS": {
      "ERROR": null,
      "RESULTADO": {
        "FILA": [
          {
            "APROBADO": [
              null,
              null,
              null
            ],
            "CANT_D_AUSENTISMOS": [
              "0",
              "0",
              "0"
            ],
            "CANT_D_LIBRES": [
              "13",
              "11",
              "13"
            ],
            "CANT_D_TRABAJADOS": [
              "17",
              "10",
              "17"
            ],
            "CEDULA": [
              "32626161",
              "30657344",
              "19676838"
            ],
            "FECHA_APROBADO": [
              null,
              null,
              null
            ],
            "HORA_APROBADO": [
              null,
              null,
              null
            ],
            "NOMBRE": [
              "BARRETO REBELLATO , FLAVIO HUMBERTO",
              "GARCIA GARCIA , JUAN OSCAR",
              "SIMONETTI RIOS , ANA CLAUDIA"
            ],
            "PERIODO": [
              "042014",
              "042014",
              "042014"
            ],
            "USUARIO_APROBADO": [
              null,
              null,
              null
            ]
          },
          null,
          null
        ]
      }
    }
  }
}