Why an author "movie-storyboards" key scenes before writing his Egypt-based mystery adventure thrillers (UPDATE)

How I visualized the opening to The Smiting Texts Egypt adventure novel. What comes first - the book or the movie? For me, writing my ancient Egyptian fiction is inseparable from visualising the theme. It’s a process that also helps sustain me as a writer through the long process of completing a novel. As a former Creative Director/copywriter in advertising, I learnt to think visually. As a result, I like to do a book storyboard using scrap art/Googled photos, or my own Egypt shots - here's the opening scene from The Smiting Texts. As the storyboard shows, I visualized a Hugh Laurie type as the witty British rogue Egyptologist Anson Hunter who is intercepted at a US airport. I did the same with the next books in the Egypt adventure series: "Hathor’s Holocaust" "The Ibis Apocalypse" and the rest of the books in the now 10 book series. Perhaps that’s why reviewers say “Egypt is one of the characters” and the writing “brings Egypt compellingly to life.” And it might also help explain why I've now written the widest range of Egypt-based novels under the sun. For me, I've (almost) shot the movie BEFORE I've written the book!

AMAZON paperback and Kindle UPDATE: Plus 2 more fiction storyboard examples (Hathor's Holocaust and The Ibis Apocalypse)