Filing and scraping I can do, I haven't really worked much with greenstuff. I figured if I wanted to actually PLAY and build an army I'd take your idea here of the SoS as Chosen, maybe see how they look swapping their swords for the Dark Elf Executioner blades. Then, for Warriors, use a combination of Stormcast Liberators with Vanguard Hunter chests/cloaks and Chaos Warrior shields. The heads and weapons I'm less settled on...do you have an opinion on if the Hellstriders heads would look too small or not "Warrior" enough? Weapons would probably be swords from the Dark Elf Dreadspears, I've just always seen Slaanesh as more of a sword and polearm group than axes and maces.
Anyway, enough babbling of my project. Love what you've made here, really a stunning warband/army.