Very nice!
Recently I came across a web page which had one using Ikea shelving to make a similar holder for inexpensive parts organizers from Harbor Freight (this sort of thing is often suggested as a "DIY Sortimo").
I've been considering it as something nice enough and inexpensive enough for the laundry room (which is where my workbench is located), but until then, I made a far more modest thing by just cutting out the interior of a Husky Rolling Connect 5-compartment tool caddy so that it would hold two HF 20-bin organizers on my Husky Rolling Connect stack (I'm cheap, and haven't been able to justify buying into Systainers).
How do you like the Lee Valley Drilling Kit? (I keep telling myself that if I win the lottery I'm going to order all their tools in Systainer kits).