I forgot to comment on your question about cage size for a young one. The biggest challenge of having a larger cage for a young cham is their ability to find food. It is usually best to start them off in a smaller cage and upgrade once they grow close to adult size. But, if you are building one and only want to build one then there are ways around this challenge. It is mostly the type of feeders you are using and ways of "containing" them in a specific location of the cage. ex: using a cup with high sides to keep small crickets in. Then just hang the cup on a branch of the plant. May not be as fun for the cham but it will work.

Hope this helps

Jim