I love this idea, I think it would make the world feel more real, and more ran by the players.

You could have linkshell or player company quest where you craft parts for the airships after you craft a certain number of the parts, you can summon an airship to fly to points around the world.

Also I would love to have furniture for my house. Housing with nice furniture just makes the house feel more home, maybe you could invite friends over for dinner or something who knows /blush.