Is that running on just plastic and copper? Intuitively, I would've expected you to need more machines than that for 9/min. Or are we heavily overclocking?
It's actually using a number of alts to use only caterium and plastic, which ends up needing less machines, also the plastic is being shipped from the oil rig in the background, so plastic refinery isnt included in the box.
And there is some overclocking to get it to have slightly less assemblers and manufacturers.