"The company responsible for this vehicular dross is Newport Convertible Engineering (NCE) located in Placentia, California. Their crimes against humanity only begin with the Cayenne. NCE converts a constellation of vehicles into convertibles...including this Prius."

See more one off modern convertibles: http://newportconvertible.com

text source: http://www.6speedonline.com/articles/what-the-hell-porsche-cayenne-convertible/