The perceived upwards tilt of the panel essentially is only a very slight one so that it doesn’t make much difference. So I deceided for the downward tilt.
I also tried this alignment method when modeling the outline of the attachment part of the hub for the Caterpillar 434E in conjunction with the projection of extruded vertices on an accordingly aligned plane:
The difficulty here for me seems to be to match the camera settings this photo has been taken with. Using automated focal length analysis like “FSpy” probably won’t get good results since the object is rather small.