1. Make a bunch of pillars the same height parallel to each other with the elements u want to stack (Not too much since I think 8+ will create BHOL
It should look like this
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2. Then in the consle (press ~) type !set x all 300
3. There's your stacked element pillar. Now do Crtl-c and crtl-v to copy and paste. Use awsd to move your selection