Sorry flywilly, but those three you mentioned as being designed for turnaround were not. Steve Helm's Bootlegger was designed in 1980 or 81, he made the 1983 USA team with a Bootlegger, the last year of "old Style" F3A. The Illusion was also designed in 82, DB flew it in the 1983 World Champs, though I believe he made the 83 team with a Tiporare. The EU1 was flown in the 1977 World Champs in Springfield, and the EU1-A was kitted by Dave Scully, I believe, by 1980.

All of these were used in turnaround, but they all pre-date it.