Hi,
CSR offers some body kits for a 986 to 987 / 997 style conversion:
CSR-Automotive Tuningshop | Carstyling Tuning Autoteile : Produktsuche
Pretty shure they can also answer questions concerning conversions.
Most parts from them are GFK = fibreglas.
Don't now any after market parts made of ABS. There are some conversions out there that used Porsche OEM 987 / 997 parts. But you have to do a lot of modification in detail to do that. Also very cost expensive.
Regards
Markus