Panel model

{
    "textures": {
        "panel": "imm:blocks/iron_block (5)"
    },
    "elements": [
        {   "from": [ 0, 15, 0 ],
            "to": [ 16, 16, 16 ],
            "faces": {
                "up":    { "texture": "#panel" }
            }
        }
    ]
}