This seems to be the final product:

  www.news.de/auto/855164801/die-weisse-jungfrau/1/

 

 The article claims the following:

- 500hp

- NBR lap time 7.27

- 0-100kph in 3.9s

- 0-200kph in 12s

- "Weight" 1360kg (corresponding figure for GT2 RS: 1370kg)

- Only available in white

- German price 178k incl. 19% VAT (lower than expected)