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My first homemade Instrument (that is not 3d printed)! A vielle/fidel that uses violin parts.
(pxscdn.com)
The mensur is identical to that of a violin, as is fingerboard, bridge curvature, and general instrument size. Currently it's stringed with 1/2 viola strings, tuned C-G-D-A. Body and neck are carved from a single block of maple. No soundpost, only a bass bar. After varnishing, I'll attach a standard violin chinrest and Wittner integrated shoulder rest, so it can be played like a regular violin.
Beth overnight was famously deaf! You may be able to find a teacher willing to work with even if it's just online