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Probably not an issue in SA, but you need to get below the frost line.
As Alex says, bedrock is best.
I'd suggest also making the pier and base bigger than you think you need, in case you eventually want a bigger mount/scope.
A cubic metre is a lot of concrete, and probably overkill, especially if you reach bedrock. I've used 600m cube in the past for an EQ6 head, but my EQ8 has a huge base.
In the past I've used 6" terracotta drainage pipe with the wide collar at the top, filled with concrete. Looks good and can be used as a bird bath if you want to move on (seriously).
Neville,
LSO
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