Sounds cool - the typical hazmat design lends itself well to 6mm, removes some fiddly joints from the equation (neck in particular), lends itself well to ease of painting (basecoat, highlight/wash, detail face window, weapon, maaaaybe backpack/boots/gloves).

Agree that thoughts/progress on the human faction is a secondary goal - the gribbly monsters of Lovecraftian fame are the big draw to the setting, the same way the 40kverse largely exists to support Space Marines.

Looking forward to seeing the Cthonian - going for the massive, gribbly sandworm look? Despite liking the idea of humans being restricted to a minority of the factions, the idea of a Dune-esque Cthonian rider is intriguing to me :P