Philippe Bouchet is a French illustrator and concept artist, who signs his work “Manchu”. He has a new book called Manchu Starships due to be published soon from Delcourt/SerieB. I’m unsure whether it will be readily available in the U.S.
Bouchet works in Acrylic on heavy paper at a fairly large scale (20 x 25 inches, or 50 x 65 cm). I know little else about him; his blog is in French but has a number of other images, including preliminary sketches, storyboards, and even walk-through sequences.