Great for a first mod, but some issues with the physics:
The tyres really need updated, the temps are far far too stable. The V7 tyres are available, simply a copy/paste job!
Aero is strange too, very very rear biased, even with front wing at max. The frontwing and diffuser heights are very unstable too, meaning the aero balance fluctuates far more than any other car. This makes braking/accelerating harder, since the aero balance changes wildly.
Its also very fuel efficient Cheesy Only needs 1.8l/lap, whereas the AMG GT3 needs 2.7l/lap (round Mugello).
Centre of gravity is probably a bit too low at 32cm, whereas the Nissan which I imagine would be very similar is at over 40cm. AMG GT3 is around 36cm from memory.
That being said, the laptimes aren't that far off with some tweaking to setup, but for me its much harder to drive, quite unpredictable. I found it very hard to feel the grip, the steering goes light as if you have understeer, but if you turn more it grips more.
With some work on the physics and some polish elsewhere, this could be a great addition to the GT3 field.
Good work so far :)