My setup lacks a little creativity compared to others, but it was quick, inexpensive, functional, and convenient. Basically:
I got the Harbor Freight box. On the left half, I mounted an Iota 55A PS to the bottom isolated w/ rubber grommets. On the right half I mounted a plywood plate to raise the chargers up a little and tuck the wires under, and have 3 chargers mounted to the plate. The top of the box still has the tool organizer w/ all my connectors stuffed in the pockets.

My PS has leads out the back w/ connectors, so it can connect to a distribution block. If I want, I can disconnect the PS and plug in a set of alligator clips and run everything off another PS or a car battery or something. The distribution block has 4 sets of leads. All connections via Anderson Powerpoles.

I need to add inline fuses for added safety.

Batteries travel in a more robust steel case, and charge outside the charge box.

If I did it over again, I'd use a larger box. The three chargers are a little tight, especially w/ the leads coming out the sides. I would add a little more support to the bottom of the case, but also try not to add too much weight. Maybe a couple of dowels or something.

Sorry I don't have a pic handy.