Well, I know you can get hollow plastic spheres. The trick would be to get one about the right size that was sturdy enough to be worked on (something that's only four or five mils thick simply wouldn't stand up to ordinary handling), and also make sure that it is a sort of plastic that takes glue. Styrene is the easiest to work with and ABS next, and both are readily available in the hobby market. But there are a shitload of different plastics, some of which styrene or ABS can't be glued to. Yes, you could use hotmelt glue, but for delicate work it has its problems.
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