Initially, the Great Diapason was placed outside the swell box in the new music room, spanning the space between the two enclosures.  The pipes were just too loud in that location.  With a great deal of maneuvering, the Diapason was squeezed in behind the harp within the enclosure.   The harp has the longest resonators (bass) on the right.  The Diapason has its bass on the left.  The point where the harp resonators extend over the diapason chest is also the point where the ascending pipes will fit under the resonators--with one inch to spare!