You're using FFR as a baseline reference for correct dimensions/proportions?
No knock on Factory Five, but accuracy to the original shape is not something they are noted for. Even with the revised and improved Mk4 body they had to make some compromises due to basic chassis design. Quite a few other replicas including Superformance were splashed off of the Contemporary body shape which was redesigned early in its production cycle with noticeably higher than original cowls and rear fenders.
The Hi-tech should be far closer to the original shape and dimensions.