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Frankly, for the cost, I'd get onto Stratco.
The metal frame, underfloor and 5omm thick insulated panel walls & roof of my two room 6m x 3m x 2m observatory building was just over $4k from them (4 years ago).
For the cost of the 1.75 you could get a local tradie to make you a gee whizz setup!
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