Place a bench in the air. Place a smart rail under it. Edit the rail so an edge of it is just under the bench legs, the support for the rail should disappear. Now clone your bench and rotate it 180 degrees. Place this new bench on top of the old bench then raise its elevation by 1 block. Clone each bench and raise the elevations by 1-2 blocks for each bench. This should create a zig zag pattern. If you place your rail correctly you can float to the top of the bench stack.
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