I’ve been working on my toolbox this week too, (though I don’t know how to upload pics),I started with a dewalt tstak tote, I bought two washing machine baskets from eBay (fiver each), they fit across the tote, one each end, bolted in place, they leave a gap approx 35mm wide down one side, so I planed a piece of softwood to fit, drilled holes every 40mm ish and they hold my screwdrivers, files etc.
That leaves me with 10 small baskets to hold my other tools, and a space in the middle for hammers etc
I must point out that I will be using it as a general diy box not a bike tool specific one, but it could easily be used for the latter, cost about £30 in total by the way
I have tried these technicians boxes and bags, but they are never quite right, the beauty of a tote, you can grab/replace tools easily, but they can get wet/stolen if left in the open, and a plain tote is a pain , cos the tool you want is always at the bottom