A good effort

I actually really like the way you've incorporated the vents in the front bumper - this looks really cool
I think you could do a better job with the arches though - you've kept the shape of the GT86, not the shape of the Lexus. What makes Rocket Bunny kits look so good is that they all flow with the original shape of the base car.
Shaping the rear arch to match the door would have worked better, something like this:
You also need to be careful with your perspectives - make sure donor parts match up with the base. I have drawn below the shape of your rear wheel (red) and the shape of the base's rear wheel (green)

You will notice that the shape is completely different - consequently it makes the perspective of the wheels look off, and the whole chop look a little strange. Little things like this make a big difference
