Those cultists really have turned out a treat! I am unashamedly nabbing your design; they'll make for a great set of intro models for whichever of zona alfa, zone raiders or stargrave I can get people trying when the opportunity arises.
Now that's a great idea! I even happened to have a box full of hunchback cw bits on the table, but there were no banner tops. Maybe that's why I just hadn't thought about them. Too close...I can see why you don't want spikes on the wheels, but do you have some sort of chaos icons? Maybe shields as hub-caps? Or banner tops? I see parts from the old hunchback chaos warriors there. If you happen to have the big circular banner tops, would they fit over the larger wheels?
And crammed with weird detail that's sometimes hard to decide how to paint. Is it iron, gold, glossy red, sickly skin or something else?