It's important to consider the medium you should use when telling a story because each method has a unique advantage overs its counterparts. For instance, stories that are mostly about a character's interior evolution are best suited to novels because the written word lends itself to investigating a character's innermost thoughts. Films are able to provoke mood through the use of sound and imagery, lending itself to stories that are driven by the senses or by actions rather than a character's thoughts. In fact, films tend to fall flat when they attempt to include characters' thoughts.
Approaching your book like it's a movie may mean you'll miss out on the advantages of writing a book. Instead, you may focus on the elements that are ill-suited to novels, but are great for films.
Storyboarding scenes from a novel may be a good idea if you're writing a story that contains a lot of action or heavily relies on the characters' environments because you can then create a visual reference that includes characters' positions and movements. No more teleporting characters in the middle of scenes. Writing a script before diving into prose may be a good idea if you have difficulty getting through the first draft because it will give a layered approach to writing. Instead of struggling with all elements of prose at once, you tackle each piece one at a time, giving your story multiple passes to make it rich.
In the end, your process is personal, so whether or not others think it's a good idea, you should try it and see how it feels. Writing (and drawing) your story in another format may not be the most efficient way to write a story intended to be a novel, but if doing that gives you better insight into your story then your process isn't wrong.