Those Berzerker wolves look great!
I'm liking how the Berzerker-wolves ended up.
Now, my question is this: If the Cult troops are going to be enslaved Loyalists, what are the Rubric/Noise/Plague Marines going to be originated from if the Berzerkers are Space Wolves?
Noise Marines might be blood angels. But that's sort of a stretch. I can see blood angels falling to Slaanesh like decadent vampires but I don't know how to make the "noise" connection.
Rubric Marines are going to be a mix I think. The aspiring sorc will be a Word Bearer and he'll have mindless slaves from various chapters. Or maybe they'll be a special kind of chaos spawn growing out of power armor. I also had the idea of using spirit hosts from AoS to make haunted/possessed empty suits of loyalist armors.
Plague Marines are the hardest. My other army is Black Templars and I have a lot of fluff around these two armies fighting each other. So maybe just zombie black templars? I don't know yet :/
For slaanesh/noise marines, what about White Scars? Entranced by the trill of the hunt and the perfection of blades, the sonic blaster Noise marines might be themed as heralds with horns, drums, and other noise makers. (Maybe call them squad Jerico, after an ancient legend of walls brought down by trumpets alone)
The AoS idea does sound cool, but another counts-as might be Iron Hands whose bionics are taken over by a technovirus. It keeps reactivating and dragging the screaming weak flesh back into battle.
Maybe have a tech-marine/priest conversion as the squad sorcerer?
For Plague Marines, rather than directly your black templars, taunt them with their bloodline.
An Imperial Fists squad, pushed beyond the brink of mortal endurance. When they asked for help, Nurgle Answered.
The Yellow armor, now streaked by bile and rot, greens and browns slowly obscuring their former colors.