Regarding the photochop in the first post - the divot in the butt end of the body will need to be at least an inch deeper to work with a headless bridge. In addition, the headstock would have to have about an inch of meat beyond the end of the nut in order to help manage the trussrod nut. Otherwise, as mentioned, you'd have to custom build a headpiece that could accommodate the location of the TR nut and provide access. I can't find it now, but there is a thread here where a guy did this very conversion with a jazz bass, and he also fabbed up a custom headpiece out of billet aluminum...