Made great progress over the weekend, finished the sponson conversions, the missile racks and the servitors.
Speaking of servitors, one is just the stock Exorcist servitor, converted to be empty handed, the other is a standard servitor converted to look like he's part of the machine, and holding one of the Empire Hellstorm missiles.
The sponsons are converted from the Bane Blade heavy flamers and multi-meltas from the Demolisher kit. The turrets get flame-storm cannon from Baal Predator.
The build is really coming down to the wire now, really just the green-stuff work on the back of the pipe organ left to do.