This was a project I finished some time ago and I'm now going to dust off for the Guardian's Network campaing.
They started as a Necromunda Gang, complete with objective markers and alternate builds for the Heavies. All of them were done using the Catachan Command Squad, the Cadian Infantry Squad and the Empire Flagellants, plus assorted bits and a touch of green stuff.
Magister Jacob, Leader
Deacon Steven, Heavy
Deacon Martin, Heavy
Brothers Michael and Jude, Gangers with lasgun
Brothers Marc and Peter, Gangers with autoguns
Brothers Karl and Simon, Gangers with close combat weapons
Initiates Lu and Tim, Juves
Yago, Wyrd Pyromancer
J.J., Hive Scum
Angel Eye, Bounty Hunter
Nobody, Ratskin Scout
Water Still and Loot Counters
From the beginning I was planning to use them as Astra Militarum in regular 40k, so the Juves and Heavies with Heavy weapons were modelled to form a vignette once put onto a 60mm base.
The rest of the models were assembled so that I could deploy a Company Command and two Veteran Squads, with the Hired Guns acting as unit leaders and Regimental Advisors.
Then I started adding support, in the shape of a Scout Sentinel Squadron converted to represent industrial vehicles.
The Demolition Crew
And finally, a Chimera to act as mobile temple for this mysterious cult, spreading quickly through Mancunius Dome.