‘Behind the Scenes of Star Wars: The Original Trilogy ILM Special Effects Makers’:-

https://www.youtube.com/watch?v=85MK2GDkoxo - at the Danny Nguyen youtube channel. (A 2015 Documentary. 59 mins)

The Blurb:-

“Watch the Star Wars Original Trilogy – Behind the Scenes – ILM Special Effects Makers. Learn how those amazing and groundbreaking effects where achieved in 1970’s & 1980’s.”

I have to admit, I like the original “Silver” Death Star concept quite a bit.