I started braining out on the pots. Thinking of cutting out 4 big holes on the bottom of each. Just leaving a strip cross shape of fabric on the bottom to hold it together.
Then make an individual table screen for each pot to sit on. Then set a table screen on top of a pot. Then stack another pot on top of that screen. Worms can crawl through the screen. Having a table screen between each pot would make the pots more stable and even when stacked.
I already have some 1x2's just need to grab 3 more. I already have the 1/4" mesh. Then some plywood for the bottom base and the lid . Then I can stack 4 pots and be stable. Another $15 to spend.