The layout system and the meta-level techniques have been originally implemented using a now obsolete version of Macintosh Common Lisp (MCL) and the PCL implementation of CLOS, which has been developed at Xerox Palo Alto Research Center. Recently, we upgraded our layout system to a new MCL version (release 2) offering an own implementation of CLOS. The upgrade of our meta-level techniques is still pending, since this MCL version currently supports no meta-object protocol.