I appreciate you putting in the effort of measuring. Thank you for that.
However, hoof to hoof measurements only tell so much.
As far as depth goes, I'm talking full-fledged enclosed passenger cars. So the poses I'm concerned about width-wise are poses like the Bow-Tie Pose, where the head is turned to the side. Measured from NDS outside hoof edge to outermost edge of face, that one's almost 3" wide.