That is huge, you don't need to go that big but if you have the space and materials it will be great for Suzy. I would love to see some pics when you are done. I think the grout will be fine if you seal it well. Are you planning on Belly heat? Tiles will be really cold so you may need some sort of additional warmth. I would also be worried about the weight and movability.
Just my thoughts, but good luck, it should look great.
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