This image comes from a student in our first attempt at training with an island as the basic model for reference.  The project was so successful that it inspired the creation of a more versatile island.   Notice that this project was done on AutoCAD R13.  Amazingly, we were able to let 6 students share work via Xref's through the instructor server which also hosted the solid model of the island - an island which was created live during class by the instructor.