I have been watching The Imagineering Story on Disney+ and it is a great Documentary about how the artist and engineers which are called "Imagineers" have created and built all the Disney Parks and attractions Worldwide. There is a total of 6 Chapters at about a hour each.

In chapter 6 "To Infinity and Beyond", if you fast forward to minute 43, there is a segment on how they came up with and built Galaxy's Edge and its attractions, if you want to check it out. While the entire chapter is about a hour long, the Galaxy's Edge segment is only about 15 minutes.