I'm in the process of trying to design a mold for a complex part, this globe for a gumball machine used on a puppet I'm in the process of building. However, I've run into some complications, due to the design of the part. It's hollow, but it has to be a specific thickness, and due to the interior structure of the part making a mold of the inside would be difficult, if not impossible. In order to make it exact, there's also a seam inside the piece that needs to be replicated, so making a mold of the inside is a necessity. I've attached some photos to explain the part's design. Any ideas on how to make a mold that would replicate these requirements would be greatly appreciated!