Hi,
I understand your concern and why you're looking for clues. 8mm of forward movement is quite a lot and I'd expect to see some distortion of the engine mounts or mounting area. I'd bet the rubber bushes in the lower links would be distorted as well and if you dismantled from the rear hub carriers I bet they wouldn't go back easily either.
At first glance 14mm sounds a lot of toe in, but is that per wheel or the total spread over both wheels ? If the latter, it's not that far out, if it's per wheel them something is wildly adrift. So unless you're sure it was correct before, I'd not take that to be conclusive evidence of frame distortion.
cheers
Brian