Are you all aware there are 2 types of pre coolers and exhausts, the narrow type fitted to the GR1 and the wider type fitted to the F3, GR4 and probably the ECR? Accordingly all the panels in this area are differently shaped. I only found this out by accident when trying to fit post mod pre cooler exhausts and panels from our GR4 onto our GR1, subsequent research revealed the answer.
I'd suggest that the model is based upon a GR1/IDS but it is being compared to a GR4.