Has anybody been able to make one of these?
Ghost Shells are currently not a feature of FWsim. You probably already know that, this is just a quick info for anyone else reading along.
That being said, somebody might have managed to build something that looks similar by combining many different stars with different timing.
Proper Ghost Shells are on the wishlist for future updates!
yes it is possible with the custom pattern, rotation and brightness of stars
As well as set pieces!
Yes, they do it, but nowadays it is very time consuming and tedious. In practice, you need to set parameters for each element of the sphere.