Rocket Ship 12 string tuned to 5ths

Each pair of strings on this 12 string guitar is tuned to 5ths rather than the usual octaves and unisons and has been the object of a lengthy experiment since I bought it in 2001. The main strings are in standard guitar tuning intervals but down a tone and a half, and what would be the octave strings are tuned a fifth above on all pairs. Needless to say, the string set has to be made up of custom gauges with a 56 for the bottom C# and a 9 for the top G#. More details here