Yes, you could just buy the metal, cut it to size, deburr the edges etc, but I thought I'd draw something up and 3D print it in ABS filament.
The side wall panel has to be mirrored to print the other side.
The thickness is 4mm @ 30% infill density. The original design/print was strong enough to take my weight, carefully, standing on it lol. The support bar is there for a reason lol.
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The author marked this model as their own original creation.