Interesting. I like the modularity and ease of reconfiguring. I think the base plate being 10mm thick is a fail. As you found out, that can waste a lot of volume.I'm going through the toolbox again starting to reorganize and clean things up. I picked up a bunch of Tool Grid (which is made by a company in Burlington) and I was able to condense all my screwdrivers down into one drawer, and freed up a smaller drawer for my nut drivers that have been hidden away for a while.
I'm super happy with how the tool gird looks, not happy with how tall it is. I had to take up one of deep drawer for screw drivers, and relocate all my hammers to the garage floor for the time being. But I've got a solution for that.
Before:
After:
Similar clips with neodymium magnets would allow you to organize right on the drawer (including a thin protective liner if desired).