Looks like most pieces are laser cut, and the two boxes are 3d printed? This is a great start, but I must question some design decisions, such as the choice of white acrylic and PLE (ABS?) plastic, which may be prone to discoloration from coming into contact with our colourful reagents. At the very least, it will certainly yellow with time. Also, finger-joints are super easy to cut and glue together, are reliable, and will yield a clean, flush fit. With some improvement, this could be a great display rack indeed.
With that in mind, I'd like to share my solution to this problem:
as seen, Just-a-Box™ incudes an attached lid, preventing collection of dust and other fine particles. It also features a handy carrying handle, for obvious convenience.
Inside Just-a-Box™, you'll find all my testing supplies, complete with the 9 reagent bottles - 7 from the core kit, plus GH and KH.
(I only count 8 slots on your rack - is that by design?)
There is also ample room to store test tubes and various other tools, such as the pipettes and watertight containers for grabbing a sample from several tanks and testing them all in one sitting. The colour swatch card is also handy, as well as the manuals for reference in those rare times I get to test my tanks in a Drunken Stupor™
The closed container has my 4dKH reference solution. The standard-issue Chinese drop checker solution is also in there for good measure, seeing how it's really just a PH reagent.
The reagents are arranged in an order that I find most efficient for testing. It goes like this, starting at bottom left: Nitrite, Ammonia 1, 2, Nitrate 2, 1, (over to bottom right) pH, High Range pH, KH, GH. (ask me if curious why I find this order most efficient. I go borderline OCD with this stuff).
Best of all, Just-a-Box™ comes with built-in support for a (small) expansion in my reagent arsenal, and is fully compatible with other brands of test kits (so that I can ditch API once these reagents run out - again, ask me why).
One can conjure Just-a-Box™ of one's own by going through the junk in one's (or a friend's) garage. It will likely not come with a sticker as ironically irrelevant as mine. Though if you recognize it, +20 to your Ops-fu.
P.S. Yes indeed, the separators are hand-cut from a single sheet of finest-grade corrugated cardboard.