Use the Fancy Product Designer as preview

I'm creating a product and control all the custom options on my html page and use the Fancy Product Designer as previewing and generating printable file only. No any editing feature in the designer. Do you have any sample of that?

On the other hand, how do I load a SVG file to fit the canvas width? I've set these in the product parameters and set it the same width of the canvas, but it didn't work.

"parameters": {

            "resizable": true,

            "resizeToW": 600,

            "scaleMode" true

}