Quoted from pinzrfun:
Those appear to be just standard slotted channel iron and shelving from Home Depot/Lowes etc. Different length supports are available for different width shelving. For our mad scientist lab I bought and stained some wood a dark brown. I like how he has the different elevations -
Since these don't weigh a ton, floating shelves would be an option too - they come in all different lengths and colors - we have a few in the game room bathroom.
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What is that interesting lit rack to the left of Cassandra ?