Combining Models

{
    "default": { "model": "base_model" },
    "variants": {
        "facing=north":  { "model": "model_bit_1" },
        "facing=north":  { "model": "model_bit_2" },
        "facing=north":  { "model": "model_bit_3" },
        "facing=east":  { "model": "model_bit_1", "y": 90 },
        "facing=east":  { "model": "model_bit_2", "y": 90 },
        "facing=east":  { "model": "model_bit_3", "y": 90 }
    }
}