The Doorian was hand-carved from a reclaimed hardwood door and built entirely from scratch.  It's giant 30.8" scale length allows for very close frets like 16/9 and 7/4 (an approximately 30-cent, 64:63 comma).  My most commonly used tuning for this guitar is 60-80-120-160-180-240 (B-E-B-E-F#-B down a quartertone). 

Scroll down for a pitch-map of that tuning.  Doorian features many 11-limit combination harmonics like 35, 55, and 77.