A SuperfastMatt video showed some racking for his Stanley storage cases here:
He shared more about them in the follow-on video and linked files for printing:
I don't own Stanley cases. I made a mistake in college and am now ashamed to own too many Harbor Freight cases:
His models also imported into Fusion in some weird, imaginary units. He used strangely-sized aluminum extrusions. And his racks were designed to print in sections on a smaller, inferior 3D printer. So I modeled my own in real units, to use 20 mm aluminum extrusions, to fit my Harbor Freight cases, and they print in one piece on a Prusa XL. So print your own. Or watch me do it.
It's worth mentioning that the Harbor Freight containers are a smidgen narrower than the Stanley ones. About 10 mm. So the outside to outside dimension of your vertical aluminum extrusions should be 470 mm. The included Fusion file is 480 mm outside-to-outside.
The prints are 62 mm tall, so vertical extrusions are 62 times however many shelves you want tall in millimeters.
The author marked this model as their own original creation.