I was brought on to the Godzilla: King of the Monsters pre-production phase through Studio ADI to help design Rodan, King Ghidorah and Mothra. Before focusing on Rodan, I worked on King Ghidorah / Monster Zero. I went through a handful of designs, starting with quick thumbnail silhouettes, then flushed out / blocked out, rough 3D concepts all under the supervision of Tom Woodruff Jr.
This design explored a much more serpentine body suggested by Director Michael Dougherty. The base of the necks that sprawl out from a central form was a beautiful design concept created by Simon Lee / Spiderzero that the director requested to be integrated into this design. You can see his original rough concept in the second slide here: https://www.instagram.com/p/BylhPIulyWe/