Super clean, thanks for sharing the build pics with us.
Home Depot sells a four or five shelf unit you can configure however you like. Holds a few thousand pounds it says as well. I think it’s like 4’ wide.
As long as you keep feeding the bacteria it’ll keep growing3-4 month cycle?!? That seems insane.
I think most cycles are complete within a month or so without any additives to speed things up. Won’t the beneficial bacteria starve if the cycle is that long?