Once Van had made all of the modifications and changes to the Stitts Playboy to create the RV-1, he flew it to many fly-ins, airshows, and events. He wanted to show what he created to the show that it was possible to have "total performance". A number of pilots were interested in modifying their own Playboys to be RV-1's.
Van typed up plans for the wing modification along with drawings and sold these plans.
He also had molds for the cowling and the wheel pants but I will leave it to better informed individuals as to the sale of parts from the molds.
Take a look at the following pictures
. They may be the same as what you have.
Great piece of history !