How to use marble as a surround over a cast iron tub?


I have a cast iron tub that is in an alcove. Wondering if it's possible to have a marble or quartz top placed on the top (with cut out of course) to make this tub look like an undermount. I'm thinking that some kind of durable padding between the tub and the marble/quartz would be needed and a good amount of caulk to seal the gap between the top and tub. On the skirt, I will use plywood with batten. Of course painting, then a couple coats of marine varnish. Crazy idea, looking for an opinion.

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