I've had a hard copy of this for years, and I love to flip through it. Syd Mead is one amazing craftsman. I appreciate the other work, but for me Syd Mead is a huge part of Blade Runner. It just would not have been the same film without his work.
On page 14 the Spinner has a gun mounted on the upper rear. That gun was actually built then removed for filming. I know the guy that built it. Years later it was used on the Star Trek Scorpion vehicle.