Jeff,
While I am not certain about Richardson specifically (I live about 20-25 miles from there), I can guess there are 30-40 RV's within 45-60 minutes of Richardson. Up at Jay Pratt's home base (Hicks Field) there are over 10 RV's I believe. Then not far from there, where Doug Reeves is based (NW Regional), there are over 20 I believe.
What's your schedule like? Maybe we could hook up. I would bet Jay Pratt will be around, since he is in the business of building RV's. Plus, he's got an RV-10 well under way over at his shop. Let me know, and/or PM me with your contact info, schedule, etc.
Take care,