David from Solid  Brix Studios  shared recorded presentation by  Rob Johnson (senior art director  at LEGO Starwars) that was a part of Star Wars Celebration 2017.  It  explains how  LEGO sets are designed, not only Star Wars, but those are used as an example.

There is not much new stuff for seasoned AFOLs, but  for less hardcore  fans it can be great  mine of information about their favorite toy.