I would suggest more bodies. 10 arkanauts with their special weapons to go in the Ironclad and plop down on objectives.
Here's what I'm considering with the point drops:
Skyport - Barak Zilfin
Endrinmaster in Dirigible Suit w/ Great Tinkerer
3 Endrinriggers w/ Drill Launcher, Aethermatic Volley Gun
Ironclad w/ Great Sky Cannon, The Last Word
^Khemist w/ Staff of Ocular Optimization
^Khemist w/ Spell in a Bottle (Warp Lightning Vortex)
^10 Thunderers w/ full special weapons
Frigate w/ Heavy Sky Cannon, Magnificent Omniscope
^10 Arkanauts w/full special weapons
Frigate w/ Heavy Sky Cannon, Malefic Skymines
^10 Arkanauts w/full special weapons
I'm undecided on which battalion to go with between Iron Sky Command and Iron Sky Attack Squadron. 18" battleshock immunity bubble or ability to deploy out of my boats after Fly High is a tough call. Leaning ever so slightly towards the Attack Squadron. I'd like to replace one of the Khemists with Thundrik but I can't quite seem to get the points/transport capacity where I want it to be if I do that. Originally the list had 3 Gyrocopters in it and I'd like to give them a shot here, but I think the list benefits more from having a second transported Arkanaut squad able to grab objectives or screen things.