@Killertut I wish we actually had even just one arboreal T in Australia. We've got 2 tree funnelwebs which due to their toxicity are very rarely available. I'm hoping to make my H.Cerberea a similar setup to this one day soon. How did you make the background, is it handmade or just cut wood?
@Killertut you may want to consider 10cm for substrate. They will hollow out all of the dirt and add it to the web curtain/tube. You are probably okay. You have enough moss and they love to use that also. They are a bit of a pet hole so perhaps less substrate may make it come out more.