The Opera Frobozzica was an opera house and one of the large-scale architectural achievements of Dr. Koepp. The exact date of this construction is unknown, but his Gray Mountains Asylum project is dated at 680 GUE. Dr. Koepp later miniaturized this building, and resolved major construction issues such as faulty foundations, weak support beams, and potential flood and slide zones by performing extensive testing on the miniature models.

Some of the functions of the large-scale model could only be operated by using the miniature. For example, the concert hall could only be properly lit by switching on the stage lights in a miniature model. This created extreme difficulties during the period when the opera house was run by Diva Maria Calloused.

SOURCE(S): Zork Nemesis