https://www.bootstrapfarmer.com/collections/flood-trays

Here is a link to the site where I bought the large flood trays, and I buy my 1020 trays from them as well. They sell that whole setup already assembled. I sourced everything for these two and assembled them myself, was half the price, but I had a lot of time in finding parts and assembling them. Just depends on if you have more time or money lol. Yes, they do work great for winter greens, I kept my girlfriend and I in micros, lettuce and bok choy all winter with just one tower.