Orange, my car is too far away to give a quick answer but I will be visiting it in a week or so. What measurements are the problem in your case? Is it the distances of the inverted "Z" angles of the firewall from the wing/fender seam where you have the rule laid out, and/or from the strut mount back to the firewall seam? Are you able to draw some pointers on your picture to highlight please?
All that apart, it still looks excellent ... but sadly looks don't make parts fit! I hope for you and all of us waiting this is a minor but solveable problem.
Regards