Hah! Funny you should ask. This very site contains a "hosted site" called the Cosmonomicon (there's a discussion board for it somewhere) which is creating a set of rules of flying vessels, including how to create said monstrosities.
Sadly, it's not yet finished. I'm still putting together a list of components that one assembles to create the vessels, but the basic rules, covering movement and combat, are in place and you could probably throw something together with that much.
The various rules are mostly posted on the discussion boards, or email me and I'll send you the lot.