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Paul from my efforts of researching I have worked out I need between $3K-5K, and that covers the slab or floor construction and the structure. I have a pier, but that could double if I get a second one. I do recommend a pier from Steve Bain, they are built like the proverbial. If you go with a concrete/metal pier and a raised floor you could get one of those observatories like a pod etc. I must say that the observatory that Lee (Plasmodium ) has built has more than got my eye, it has some fantastic features and suits a sloping site.
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