There's going to be some Horus Heresy books set on Tallarn featuring the Iron Warriors, could be good for inspiration:
http://apocalypse40k.blogspot.com.au/20 ... llarn.htmlIn my opinion the
Typhon Heavy Siege Tankwould make a much more appropriate unit to include in the list instead of an allied IG Stormsword.
Stormsword's are rare IG tanks, modified field conversions of damaged Shadowswords. The Typhon meanwhile is a tank specifically associated with the Iron Warriors - one their primarch wanted it for his legion, to quote from the background:
Quote:
the Typhon was developed at the request of Perturabo, Primarch of the Iron Warriors Legion, who wanted a tank that could rival the great batteries of the Imperial Army in firepower, but maneuver and deploy at the speed of a Space Marine force.
Ruleswise a Typhon would be the same as a smaller Land Raider, but DC2 (the tank is a fair bit bigger than a Land Raider - see
here for a side by side photo) and with 2 heavy bolters or lascanons and the same gun as a Bombard.