I have been wanting to do this for a long time. To create an entirely new section of the campaign world that I could get the players interested in and still be very different than the traditional knights and dragons setting.
I have also always liked the concept of aerial combat and how using three dimensions would alter how a character looks at the world. So I started a project called I want to fly so that I could add that aspect to my game.
I am not sure that I want this to be more magical or mechanical in nature, but I wanted a place to 'talk out loud' and see what makes sense afterward.