There was another long thread talking about tool storage. If I read the OP correctly, the OP has an old fashioned narrow, tall “stacker” toolbox and wants a 50” roll cab like a KRL722.
I wrote in that thread that the roll cabs were designed for pros in specific sorts of shops and working conditions. I also said, the set up I believe out OP has is the most space efficient for smaller shops.
What I failed to mention is the Edd China setup. You can see it on older episodes of the British car restoration show “Wheeler Dealers”. Edd has a 2 post lift with a narrow toolbox stack at each corner. I never paid close enough attention to figure out how his tools were divided among the, but off the top of my head, if you had metric in one, SAE in another, frame and body work tools in a third, electrical and diagnostic in the fourth, that would make sense to me.
I have a few things I work on that have both metric and SAE hardware (2018 Bobcat) but most things are one or the other, telling me it’s ok to segregate units.
Maybe a second (or third) smaller box would make sense.