I've owned and still own quite a few of the wide body pins, Star Race was a good bit wider than any of the others, but I have never owned Embryon. I currently have Space Invaders, Spiderman, Haunted House, Force II, Superman, Paragon, STTNG and God of War setup. It was wider then all of those, but I no longer have it so can't give you a measurement.
I do know the playfield glass was wider then any of the others and the cabinet was essentially the same width as the head. If you want measurements of the others I've listed, I can take some when I get home.
Are we measuring the outside of the rails? Actual width of the game or the width of the playfield?
Greg