Apologies for reviving this post, but the airships look amazing. Looks fitting for an airship infiltration.
Believe it or not, there's a rather funny coincidence about the airships' artwork and old-fashioned based aesthetics...
They harbor some strong resemblances of some airship themed stages, mostly likely from Frozenbyte's latest game in their Trine series(never heard of it? its a rather neat series), Trine 5: A Clockwork Conspiracy; the 17th level, The Magnificent Airship, where the framed Heroes of Trine, Amadeus(the timid, but good-minded, box conjuring wizard), Pontius(the eponymous, heroic knight) and Zoya(a rather leeway, but good-hearted, thief), board Lady Sunny and Lord Goderic's(the game's main villains) central airship in their attempt to rescue Amadeus' triplets, Agnes, Julius, and Lucius from their grasp, only to find hordes of the villains' Clockwork Knight Army(the mechanical, construct-themed automatons), and complications, standing in their way, or maybe tiny hints of Sky Battalion from Freedom Planet.
They all look rather captivating. Wonder how more would look good in pixel art and in tilesets?