The final version will be a full color plate in the book. Details to follow.
Technical pencil with slight digital cleanup.
This project of yours just keeps getting better and better!
The composition of the final image will be close to the thumbnail top left of center here: titancity.tumblr.com/image/656… You're viewing it from the top, and it's an evolution of early aircraft design with the introduction of some very peculiar other technologies.