IIRC there were only ever a few Cosmic Winds made and not many survive.
I saw Ballerina perform at Redhill a few years ago, and very nice too.
I understand that their complexity ruled them out from being a commercial proposition.
The chaps round Leicester seemed to have gathered up most of the remaining bits more than 10-15 years ago, but I haven't heard anything recently on the progress. It would be nice to see another one return to the air.
All of the Formula 1 types I've seen seem to be made to measure for 50th percentile pilots. How about a Midget Mustang?