Tuning a fretless guitar like an oud is easy. This video by Sylvain Bouancheau is in French but has English sub-titles.
Accorder une guitare comme un oud, c’est facile !
External Links
Download summary PDF : https://piecejointe.net/?2htsmftusa
http://sbd-projets.jimdo.com
Thanks to https://solteoverbo.com for subtitles.
More Alternate Tunings