Modular Tool Corral

It's here! The world's first easily customizable, inexorably modular, supra-comestible,
mobile tool corral. And it's cheap.
A small, $12 furniture dolly is at its core. I chose 2x4 framing because it is cheap and gives me a surface to mount just about anywhere easily with cheap drywall screws. This suits my purposes and gives me a specific place to put each tool. Tools tend to clutter my workspace and then elude me when they are needed most, so I am trying to fight back with a bit of making.
I also incorporated a magnetic bar and some sturdy parts trays. A lot of the structure is re-purposed from what I had lying around. It cost me around $50 at Harbor Freight, not counting filament and tools.
The top array utilizes a quad frame of 7/8" (22.3mm OD) dowels spaced 60mm apart (from the centers.) 1/2" schedule 40 PVC will also work but is not as snug. The tool holder blocks snap in and can be screwed or riveted in place.
I also added a luggage carrier that allows the whole thing to