Chaos Sisters kitbash wip, cc/tips/lore ideas?

I just finished the building phase of my chaos sisters squad, which I plan to use with traitor guardsmen squad rules (I put them on the correct size base for this). Im fairly happy with how theyre looking, though theyre a bit rough as the tools I have aren't perfect for a project like this.

Im making them for my Night Lords army, and running them as mark of tzeench. I think tzeench corrupted sisters working for the night lords sounds like a pretty cool idea, but I haven't really thought of much background or lore for them yet. Ideas are welcome!

Any ideas or tips on how to improve them would be greatly appreciated as well. It's my first time doing a kitbash like this, and it was a lot of work, but it's been super fun so far!

Removing all the imperium symbols from the armor was a ton of work, but I especially dont have a good way of removing the aquilas on their right pauldrons. I was thinking I could maybe leave those on and paint the wings red to make them look closer to the night lords red wings symbol? What do yall think.

For the rest of the paint job, I'm thinking night lords blue armor with silver trim, with red on the robes, guns and other accents. the parchment strips present on some models will be painted as flayed skin.

they're definetly rough, but I'm really happy with how they're coming, and super hyped to paint them up!