In the last week I have spoken to a number of round engine drivers who are planning to bring their 20's and 30's Vintage aircraft to Airventure 2012.
Jim, we've found that listing (and especially including a picture of) the aircraft pre-registered for our fly-in on our website helps enthuse and encourages others to participate. So maybe a listing (pictures?) per your statement above would help get more "round engine drivers" to AirVenture ??

Brent Taylor