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Steel Hellkite is one of my favorites, and it would help with both making the deck offensive and combat fliers.
Since you have the mana myr, you could drop your land count to 22-24.
it seems like you run too many 1-ofs and 2-ofs
seeing as your focus is artifacts i'd suggest cutting bone to ash for Stoic Rebuttal i'd also suggest adding some Dispatch for some removal. darksteel juggernaut can easily be replaced by Steel Hellkite or Wurmcoil Engine. id also consider running Vault Skirge over snapsail glider because the skirge can be played on turn 1 gains life and will always fly. maybe instead of the copper and gold myr you could try running Plague Myr. golems heart could easily be replaced by Pristine Talisman as it provides extra ramp. your also running way too many lands try playing it with 24 lands.
hope this helps i post a bit more later
If your really worried about fliers id suggest Corrosive Gale for your sideboard and possibly 2 Day of Judgment main. a creature that really fits your artifact theme is Razor Hippogriff plus he helps against fliers. one of my favorite artifacts is Mimic Vat it can basically make your opponent feel like he's playing the mirror also combined with the hippogriff can allow for returning your artifact threats ad nauseam.