Interesting. Glad I asked for pics. I’m a little surprised by what I see.
From your initial post I was curious about what a pro might have and need day to day such that he can’t make it all fit in one of the biggest carts on the market. I was excited to see tools I didn’t have.
What I see instead is the opposite. Warning: No criticism, no tool shaming. Just a fan boy, wanna be, amateur‘s reaction to a legit pro’s box:
- Pretty poor use of space.
- The basic layout of the box doesn’t make sense to me. I always felt SO did an outstanding job of sizing drawers to fit their tools in a sensible way. Not getting that from this box.
- I see an awful lot of what looks like redundant hex sockets, and very few specials. Where are the swivels, the stubby torx, swivel torx. Where are the goofy huge Allen’s for German car drains?
- I see an ungloatable pile of similarly sized ratchets. That makes no sense.
- Surprised I don’t see more diversity. Like dedicated 1/4” ratchets with 8 and 10mm sockets, more custom and special stuff, hose clamp pliers, brake tools, stuff you ground down. I really just see basics poorly stored.
Not a criticism. My advice is to get some storage ideas from the threads here or YouTube. Don’t buy a new box. From what I see, I think you could go smaller and lighter. I sort of like the traditional roll cars with the exposed tray under them for funnels, grease guns rags etc.
Some old pics of my stuff:

I’m with you on blank spaces. This is NOT an efficient use of space. Only 1/2” drive is top left and a few misc bit sockets. And there are some sockets missing like O2 sensor sockets etc. But the variety here is what I have found essential and what I’d expect to see (have seen) in pros boxes.
Top of my cart just has junk in it. Total waste of space, but I had my reasons at the time.

Socket and ratchet drawer. I keep my impacts with my guns. This is just the basics, a high speed kit. I can easily lift the end of this little cart to get over air hoses, or curbs.