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I made up my mind - I am going with ROR.
All I have to do is to make the cover (welded steel frame, polycarbonate or colorbond roofing), remove the existing colorbond from 2x2m area in the corner and place two rails (similar to what is used for sliding gates, "L" profile 25x25mm).
The second stage will be to cut the floor of the studio, so concrete pier (16~18 standard concrete blocks from Bunnings, 190x190x390) can be built on existing footing up into studio above.
And that will be it.
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