When I was designing Pigboats, I kept narrowing the focus, until it was just American Officers in the Pacific War. Then it felt right.
Avian Knights is going in the opposite direction, rapidly. Enough so that the AK of the title are just a fraction of what I am working with. The ships right now are much farther along, thanks to Levi Kornelsen, who has had some purely awesome ideas. There is also some new concepts, like claiming and guarding a chunk of mountain range in case it rips loose and floats away. There's going to be a whole alchemy based magic, because while people cannot make magic of themselves, the world has magic they can use. Which means getting raw materials from the ground is vital. Which means that there has to be a whole other avian group focused on getting stuff from the ground. Hell, even dirt for terracing is useful, and ships can't go down that far! What I'm thinking is that only a certain few become Knights. Those birds and people who cannot be knights can still perform important and exciting, game-able services.
So - floating castles carved from living floatstone, chained to the mountain range and supplied from half the world away, waiting for mountains to rip themselves out of the earth and fly away. Great shipstone keeled carriers, letting loose squadrons of knights mounted on giant birds, spreading their enormous sails and arcing away. Foragers in the world beneath, searching for precious garberries and waxwort, and finding instead ancient ruins draped in verdant green vines in the misty jungle light, as the pools shiver with the tread of great monsters.
So - I'm looking for a better title.