How to Make a Similar Hydroponic Tower

There’s a company that came out with this hydroponic tower garden thing called the Farmstand. Here are some pictures.

Here is a photo of the inside of one of the “tiers”. The piping in the center is separate, but everything else in the tier is one continuous piece.

I’m contemplating a design similar to the Farmstand but that’s better for growing indoors (grow-light coverage for the circular outward-facing plants on the Farmstand ends up being pricey).

I have two questions:

  1. How are the big plastic pieces made?
  2. Is there a better way to do this? I think I could potentially Ikea it together with parts like from this kind of website if I was dedicated, but I think it would be ideal to design it from pre-existing plastic parts if possible?

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Thank you.

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