Andy I don't know if the same material is available over in Aus., but here in the states you can buy the slate in pieces that come already surfaced and pre-drilled for mounting holes. The joints are grouted to make a complete surface that is smooth and free of imperfections. I had a site bookmarked but I don't know if I still have it or not. If I can find it, I'll link it for you.
Mike


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