This is from Incredible Cross-Sections - an amazing line of books. There is one on Star Wars locations, showing the inside of Obi-Wan's house on Tatooine and other places we never actually saw in the movies. The minutiae they create to identify parts and functions is amazing. Of course when these models were scratch built, the various parts were simply parts to look technological. The names of parts and technology descriptions were all created later.
The visual encyclopedia of Star Wars is also cool showing actual photos of movie props with similar descriptions.