This appears to be a bin not a flow through. Harvesting would seem to be by shoveling out and sorting. A single, small drain, no doubt to collet the mystical worm tea is visiable. I wish them luck. Please keep it in the shade. They have a sturdy structure. Maybe they will eventually hack away at it and transform it towards the worms comfort. I doubt they will. They seem more into the happieness and good citizenship points of it than the detailed, facts of leaning how it all works. It is not magic and happy good wishes of greeness, but knowledge of boring facts of life that make a sucessfull worm bin. So I see why you posted this. It does not seem up to doing the job they want done. But it could be with a bit more knowledge.

Is that a metal worm bin? In the sun? Are they cooking the buggers? Is it a fried worm shop?

Ah, I read the story now... it is great they are trying this. I do hope it works well enough that they are willing to work out the kinks and get it right. I agree with EqEq, close, but no cigar.