WIP update. I'm almost 85-90% done. Pics:
I now have the wet palette strapped down well enough to carry:


The interior:

In the top lid I have spare wet palette sheets, cutting mat, mini q-tips, decals, and grass tufts.
In the top base I have a brush case containing:
Several brushes, shaper, scraper, pin vise, files, small pipette, glue brush, dry brush (makeup brush), and some dental tools.
Next to the brush case are: water jar, CA glue, handle, and clay (for making bases).
In the recess at the bottom I have: brush soap, static grass, 2 kinds of ballast, decal set.
In the paint bottle areas I have: mostly Vallejo Game Color, a couple primers, and brush-on matte varnish
And I still have enough for some minis I could maybe wrap in foam or paper. Or possibly make a small flat box for them. I tried to fit my portable LED lamp there, but I just couldn't make it fit. Almost. If it weren't for the cutting mat in the lid...