Looks amazing!

It would be awesome if it was marble!! Looks similar to the link you posted, but I am in Australia, marble cladding is not very prominent/used here, so I didn't think it would be? Anyone else to second Bodo or give their thoughts?

Got my answer - non combustible material such as, natural stone - marble, granite or concrete etc.

I love the stone, it reminds me of the classic Sydney Northern Beaches cottage which is often weatherboard and sandstone. If you google Avalon beach cottage you will see what I mean. I personally think the addition of natural timber is too much as an additional finish. I’d probably continue with the weatherboard. The deck you could then do in timber and let it fade to grey.