Just a suggestion,, maybe three solid 3/4 size bessa-blocks on their ends, approx 300mm high for you tripod legs, use 3 premix bags a concrete from bunnings, one for each block, to form a pyramid around each block, then build up the ground around them say 200mm and then form/build your deck on top ? Maybe a coal chisel and lump hammer to punch/brake some holes through the 'smart slabs to accommodate the blocks ? ?
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