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This design [of the adjustable height modular workbench] is ingenious! I've never seen anything like it! Wow!
The original idea for the modular workbench was from a YouTube video that I have posted a number of times. I like the 2X4 foot size of the modular workbench because I can move them out of the way in my garage when I need to park my cars. It would be much harder to find a space for an 8-foot-long workbench. Those drill holes on the top 2X4 frames allow me to bolt together the workbenches in any number of configurations.
I used reclaimed/pallet wood for my workbench builds. The only wood I had to buy was a sheet of OSB for the bench top. I wanted a completely flat surface to work on and clamp down on. I have another pallet wood workbench with pallet wood planks on top, which is great for many projects, but the different thicknesses of the pallet wood planks make the top surface uneven. For the modular workbenches, I wanted that top to be uniform and smooth from one workbench to the next when I bolt them together.
The mobile concept comes from using those casters. To save lots of money, I buy those dollies at Harbor Freight on sale for less than $10 per dolly and take off the casters for the work bench.
Each wheel on that dolly is rated for 250 lbs. If I had to buy the casters/wheels separately, they cost something like $5.00 each. So, the dolly hack is a much less expensive way to get wheels for my work benches.

I also use them underneath my stacks of 5-gallon buckets filled with chicken feed and grains. Very easy to move a stack of buckets from one place to another in the garage.
As to this new adjustable height workbench, the primary objective was to make it work with my new table saw, so I could use it as an outfeed table at the same time. Instead of paying another $50 for a table saw stand out of metal, I was able to build that pallet wood workbench for less than $10.00, with wheels to move it around the garage.
I kept thinking about the adjustable height options when I was planning on making the new workbench. I imagine most of the time it will be down in the default position for holding the new table saw. But I also wanted the option to raise that shelf to be flush with the top and have another complete modular workbench that can be bolted together with my other modular workbenches. Over time, I came up with the idea of the adjustable legs and that rail system to bolt on the movable shelf in any number of adjustable heights. I have other tools, like bench sanders, drill presses, etc... and that might be an option for those tools.
Well, I have only started using that new workbench but I like it. Future upgrades I am considering are adding either shelves or drawers to the left side. Everything has to be removable because I need to access those bolts if I adjust the height of the right-side platform. But for now, I am happy with the build.
For people thinking about making a workbench for their small shop or garage, I think these modular workbenches are great. I was happy to steal that idea and make some modifications to the concept for my particular needs.