There were sketches by Sherwood Egbert and Raymond Loewy of a targa-type roof for the Avanti, but none such car was produced. The first owner of this car above, 63R-2833 in Pasadena, California had his Avanti modified with a targa style roof. It was auctioned in March 2019 at the RM/Southeby's Fort Lauderdale, Florida auction for $104,500, including buyer's fees.
We had two articles on the car in Avanti Magazine Issue 186, spring/summer 2019.