Ive got folders of tutorials on buckets/dwc that Ive been collecting for over a year.The link in your post is a good one.The only thing I wonder about using the pvc shut off valves is there is no screen on the back end of the plug.I do like the fact that you can go to your local hardware store and pick up almost everything you need to set your buckets up.I was having trouble finding a "bulkhead" fitting that would work with the shut off valve.
I am going to use his idea and put a shut off valve on every tub I set up in my recirculating setup.I like the idea of being able to isolate each individual unit.I also liked his idea on the level indicator.
What size air pump are you using?
Ill be posting something in a few weeks as I start to build my setup.Keep the pics coming.Your bucket looks exactly like the ones in the tutorial.Well done my friend.Take care,be well,and most of all be safe.