One of the things I like most about AoS is the fact that you can mix and match any races provided they are in the same faction, so I thought of having an allied force of Seraphon, Fyreslayers and Kharadron Overlords. Have a look at this possible list: Scar-Veteran on Carnosaur Auric Runefather on Magmadroth Arkanaut Admiral 12 Vulkite Berzerkers 18 Saurus Warriors with spears 17 Saurus Warriors with clubs 10 Arkanauts 20 Saurus Guard 8 Saurus Knights Arkanaut Frigate 1 (or possibly 2) Grundstok Gunhaulers 5 Grundstok Thunderers 2 x 5 Hearthguard Berzerkers Slann Starmaster (if there's room) This list is all about compensating for weaknesses - the Seraphon provide cavalry which the Duardin wouldn't be able to use on their own, the Kharadron provide some nasty shooting weapons and airships that can zoom around the board and the Fyreslayers and Saurus infantry provide some extra combat muscle. You could zoom the airships towards the enemy first, followed by the monsters and cavalry, so that the airships could blast things apart and the beasts wade into melee and tear the heart out of the enemy force. Then you can support this main attack with the Kharadron shooting troops, protected by the 2 units of hearthguard so that if the Kharadron are charged, they can retreat in the following movement phase and then to stop the enemy pursuing charge your hearthguard into them. At the very least you will have preserved your missile troops and at the very most you will have provided a devastating counter attack. Additionally the Gunhaulers can protect the frigate by taking wounds and the Slann can constantly respawn any Seraphon units that die in your magic phase.
It's one of the things I like the most as well but I'm mostly Seraphon & Aelf, I have yet to use a mixed list.
I love a mixed army! This one looks great, I really need to get a game or two against the kharadron overlords, get a feel for them.