This car (or it's twin #138) is currently standing at the ECO-KART eKart track in Frankfurt am Main, exellent representation - only missing the green window-taped start-number and the H&R numberplate.
I'm currently planning to do either the #57 Black Falcon Porsche or the #445 Cayman GT4 (the purple NEXEN Tires Car) sometime, but I can't really tell you when it will be done.
The regular GT3 Cup is available, I know. But they're using a version modified by Manthey Racing (aero upgrades etc.) which looks a bit different. Hence it was a bit of pick your poison which car to choose.