Easter's on the way, and I've fiddled, though not to completion, Space 1889 style kites made from half eggs.
Always thought two different-sized eggs that split in half(longitudinally), would make two ships. Connecting boom between seemed my stumbling block.
I was going to use a PotF Star Wars Jabba Skiff for one, though it's now going to be a 15mm lighter.
Ironclad's Martian Cloudship, of course. link
Mine's still in the box, which is just silly as it's very straight forward. I think I wanted to make it switchable as either sail or steam, and ended up with neither.
Now to see if anything else comes to me after posting…
Doug
Edit: "I think the old LondonWarRoom ones are now carried by Brigade." As in Brigade Games; not to be confused with Brigade Models. Good point!
Edit, part deux: Not sure if exactly in your request, but a couple of tiny blimps, an iron dragonfly, and a 'Mononef'. Crazy. tobsen77.de/index.php