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Thanks Dave,
I'm trying to avoid a full on slab for a few reasons:
Access is tight so pouring concrete is going to involve a lot of wheel barrow trips up a hill. I'm also not planning this to be a long term option and want to be able to remove it and re-instate the lawn down the track.
I've been using the bricks embedded in the lawn with a hole drilled for the tripod tips to achieve fast polar alignment for many years and I've found this to be quite stable. I'm really looking to replicate this concept with a bit of additional ground clearance and make it ant resistant.
I hadn't heard of diatomaceous earth being used for ant proofing but it seems it only works while it is dry and able to form a dust so I don't think it would work for long in our climate.
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