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Polygon
For something like that I'd mark the radius and then nail 2 5mm sheets of ply (not full sheets but rips of ply to bring the top of your shutter to the desired level) to stakes hammered into the ground. Put the stakes at around 400mm centres. Make sure that the joins on the ply are staggered to add strength. If the stakes go deep enough they should support the shutter but if you're worried then support the too with rakers or pile soil up on the outside of the shutter.
Hope that makes sense.