If you can't rescale the F1 GTR, is there anyone else here who could have a stab at it (with your permission)?
The scaling is quite significantly out, as can be seen in this comparison. In VR the cockpit feels cavernous.
Left to right: your F1 GTR Longtail, Assetto Garage/Legion/ACTK F1 GTR Longtail, Tidy's F1 GT7 port, Kunos F1 GTR (non-Longtail).
The direct comparison is between the two Longtails on the left, with the other two cars there as checks to show that the Assetto Garage/Legion/ACTK is probably scaled correctly.
View attachment 1301978