I appreciate what you are attempting to do but my past experience as well as the past experience of the vast majority on this and other forums would indicate your efforts, however well intentioned, are misguided. Do the recipients a favor. Scrub the hard drive, a single pass erase will be sufficient, then install the OS but do NOT set it up. From that point on it is their Mac and the new user can set it up and configure it the way they want to without being bothered by everything you have done or not done, right or wrong in its history. In the long run everyone will be a LOT happier.
