Alright, so as per my post on my website:

I had issues with leveling the planter shelves. Since I am looking at shipping the bare minimum to communities in the arctic, I'd like to keep shipping costs down.

The reason I went with 1x4 boards for the suspended shelves is because they are a commonly available building material that most communities would have access to.

The prior method relied on strapping the aircraft cable to the sides of the board. Right now, I'm exploring suspending the shelves from one another using eyelet bolt's and tee nut.

Here are a few photos:

The picture below shows the new setup I am trying.

Here's a shot of it from the bottom.

With this configuration, I can raise or lower the shelf to level it properly. It's not ideal from the perspective of people being able to easily set this up so I will likely be refining this down the road.

Finally, here's a shot of the current setup.

As you can see, I've taken the three suspended shelves down. I have one, and I'm currently starting the next round of test plants (Spinach and Kale) now.