justanotherbozo, thanks for posting this information, it was exactly what I was looking for! I just built my system tonight, but instead of pipe insulation, I used one of those foam pool noodles as material. They sell them at the dollar store and make excellent plugs, and you get like, 8 feet of it for 1 buck :-)
Quick question for you or anyone who has used this system: I'm using a DWC right now and will be taking clones soon. The mother is a clone I obtained that was already rooted in rockwool. My question is, once my new clones grow roots using justanotherbozo's inatructions, do I then place the rooted clones inside a rockwool cube and then place in the hydroton/netpot? I can't figure out how the plant supports itself without being rooted inside a medium, and seeing the size of of some of those roots in the pics, I can't figure out how those long roots fit inside the rockwool.