Chris those ideas for the AirVenture Cup are great. I'm going to grab them and forward them to Eric Whyte in an e-mail as well as ask him to look at this thread for information.
Tram, to go racing in your RV you have to become aware of races that are being held, meet the entry requirements and show up for the race. Currently, the best thing going is the Sport Air Racing League at
http://www.sportairrace.org which is set up and run by one dedicated man - Mike Thompson. This year was the first of its existence I believe and Mike has done an amazing job. He has a vision that this can become something like NASCAR and he is doing a very good job to make it happen. I have nothing to do with it but I sure enjoyed this season as a participant.
You can log onto the website and join for free. "Free" is a big part of the program at this point as you will see. As soon as you join you will be added to the member list and assigned the race number that you prefer. There are duplicate numbers because the member list is growing to the point that it is necessary to keep numbers constrained to two digits if possible - some people have chosen to go with three digits.
Mike has a "calendar of events" page that currently lists the Memphis 100 for October 18, 2008. This will grow as 2008 progresses.
For most (but not all) of the SARL sanctioned races (like the Memphis 100) there is no entry fee and ot other requirements are basically Pilot License, BFR, Medical, Air Worthiness Certificate and Annual Condition Inspection.
The courses are laid out very carefully and provided to you long before you leave home so you can carefully plan for the race. Often the local organizers fly the course and provide photos of the turn points and GPS coordinates in the package. The organizers at Memphis did an outstanding job.
If you need more info just ask.
Bob Axsom