Other models as well as cusotomised choice of wood, design, measurements possible.
e.g. Extended-range- / Harp-guitar
This 13-string guitar has been designed with the cooperation of Stefano Delù who ordered the instrument in D minor tunin (common tuning of baroque lute). It is tuned as the 13-course baroque lute and makes it easy for guitarists to play directly from tabulature.
in this case: spruce/ maplewood, 13 strings, tuned in 'Vieil ton'