I've got a 2002 PT 4 door convertible done by Newport Convertible Engineering. My understanding is they built 54 of them for Chrysler to test the waters for a production car but the cost of $9000 over the base price was prohibitive. I've looked and never found much info on them other than a Road & Track article. Not sure of the value or collectability of the car, but repairs can be expensive, like the roof ($4500) , there were no available patterns or kits.