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Welcome to the Bunnings Workshop community @sbajada. It's amazing to have you join us, and many thanks for your question about installing an Absco shed.
The manufacturer recommends that your shed is installed on a rebated concrete slab. However, timber flooring or concrete slabs can be used as a temporary solution. While using concrete pavers is a reasonable approach, Absco does not recommend their long-term use as a base as they are not totally secure and can affect the durability and rigidity of your shed.
Your shed currently requires two sets of Absco Sheds Concrete Anchor Set - 4 Pack to be fixed to a concrete slab. If you are instead fixing to concrete pavers, then I'd recommend you increase the number of total anchors to 12. This will mean the weight of approximately 12 slabs will be holding down your shed in high winds instead of just the eight.
Using rubber pavers under the concrete pavers sounds like an excellent way to project the bluestone underneath.
Please let me know if you have any questions.
Mitchell
The Absco Sheds 1.52 x 0.78m Timber Flooring Kit is a convenient option, though you could use treated Pine sleepers @sbajada. You'd need to use marine-grade plywood for it to have some weather resistance.
My only concern with using sleepers is that they can warp and distort quite dramatically if they are not securely fixed into position due to their moisture content. The force of their distortion could quite easily lift your shed up in the air. I'd recommend sticking with the concrete paver slabs.
Mitchell
