This sounds really cool! Especially the temperate forest one; I've been wanting to make one myself. I'm curious though, how do you plan to simulate a temperate forest in a vivarium? Are you planning on finding plants similar to those found here in North America, or are you going to try and find native plants that can survive in a vivarium year-round?
Can't wait to see how this turns out. I think everyone likes a good viv build...