Synergy Instruments out of Ontario, Canada build carbon fiber guitars and ukuleles. How long they've been at it I don't know, didn't try to find out. Just saw on Instagram they're nearing completion of their first mandolins, pictured below from their IG page.
EDIT: this company has "gone silent" and still has money taken for orders. Please read this thread in its entirety to get a sense of what is happening.
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