Ok so I've been having a think about other builds that we could do, specifically making use of our battalion.
So if we start with the fire base I would go for:
Cogsmith
Lord-Ordinator
4 Helstorm rocket batteries
Greywater artillery company
This comes in at 840pts and provides a real load of hurt from a distance.
For the battleline choices and screen I would go for something fairly cheap like:
2 10 freeguild handgunners
20 freeguild guard
This is a cheap chunk at 360pts and I think makes a reasonable screen, especially with the handgunners' stand and shoot.
At this point I think the list needs a solid hammer, something that can go in and clean up whatever survives the hail of rockets. We have 800pts left at this point so some options could be:
Sorceress and 30 Blackguard 510 points
2 6 Demigryph Kights 720 points
3 10 pistoliers 600points
30 Phoenix guard and an anointed on flame phoenix 720 points
or whatever else you fancy.
The idea in my head is that you would use the artillery battalion to really lay on the hurt at range, forcing your opponent to come to you. As the weakened enemy comes forward your hammer of choice counter punches while your cheap screen keeps the artillery safe.
As always I'd love to hear peoples' thoughts.