Hi Pete
I agree with David. The ply at Bunnings is rarely flat. An exception is the formply which is normally very flat but then you have the black film on the surface. I usually go to a specialist plywood shop and buy Russian birch. I find the price is not a lot more. I haven't tried hoop pine for a mount. I did use 1.5 mm sheets of hoop pine for two cylindrical tubes and that worked well.
Rod
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