One of the comments on Part 2 of this series suggested I check out the work of Rudolf and Robbert Das, twin Dutch futurists. The Das brothers were born in 1929 and originally wanted to become pilots, but Robbert was rejected due to his eyesight, so they started a technical illustration agency in 1952. Rudolf and Robbert made headlines when they published a cross-section of a top secret British jet fighter, but the technical details were culled from existing aircraft.
Over the decades, the Das brothers have published a number of books on concepts for future architecture and infrastructure. See close-ups of their work here.
I haven't been able to find very much information on the British illustrator Roger Stewart, but I thought I'd include his cutaway work as he touches on two subjects close to my heart: Batman and James Bond. Stewart has illustrated Batman: The Ultimate Guide to the Dark Knight and James Bond: The Secret World of 007, both from DK. Noticed a theme yet on the whole who-publishes-books-on-cross-sections thing?