When the new CSM dex is released I'm going to be making up this list pretty much. I've fluffed it as Ahriman has discovered a Webway Gate/something important on a planet and has corrupted the Primaris psyker into taking control of the nearest guard unit. It's purely a fluff list, not designed to win. The conscripts are basically meatshields for the important units as are the cultists. Cultist info is from the 6th ed stater leak, i've guessed the points.
Primary Detachment: Traitor Guard
HQ
Primaris Psyker-70pts
TROOPS
Infantry Platoon-795pts
Command Squad, Platoon Standard, Plasma Gun
Infantry Squad, Plasma Gun, Autocannon, Chimera
Infantry Squad, Plasma Gun, Autocannon, Chimera
Infantry Squad, Plasma Gun, Lascannon, Chimera
Heavy Weapons Team, Autocannon, Missile Launcher x2
Heavy Weapons Team, Autocannon, Missile Launcher x2
Heavy Weapons Team, Autocannon, Missile Launcher x2
Conscripts
Infantry Platoon-840pts
Command Squad, Platoon Standard, Autocannon, Meltagun
Infantry Squad, Meltagun, Missile Launcher, Chimera
Infantry Squad, Meltagun, Missile Launcher, Chimera
Infantry Squad, Plasma Gun, Missile Launcher, Chimera
Heavy Weapons Team, Lascannon x2, Missile Launcher
Heavy Weapons Team, Lascannon x2, Missile Launcher
Heavy Weapons Team, Lascannon x2, Missile Launcher
Conscripts
FAST ATTACK
Hellhound/Banewolf, Heavy Bollter/Heavy Flamer, Extra Armour-145pts
HEAVY SUPPORT
Leman Russ Squadron-425pts
Leman Russ, Battle Cannon, Heavy Bolter, Extra Armour
Leman Russ Executioner, Lascannon, Plasma Cannon Sponsons, Extra Armour