Yikes! Poor boy... Will he have any removed or is the vet doing trims in hope they'll occlude better?
These images might help for comparison. Sorry I can post the direct pic in the post, only the links.
books.google.com.au/books
http://www.medirabbit.com/Radiography/X_ray/Radio_skull.pdf
This video too shows fairly normal lateral skull at the beginning then one showing root elongation like Rufus has. The xrays are not that clear unfortunately.