Ever since I saw a ONE string Stroh violin at Larch Street music in Bogota NJ I've been fascinated.
I've done some online poking and found that they made these around the turn of last century to project louder than a normal acoustic.
Looks like they made a few stroh mandolins.
Why not a guitar or a tenor guitar.
The idea is that the bridge connects to a gramophone type soundbox essentially providing the vibration instead of the needle in the record's grooves. Then to a horn to amplify.
Also, there is a video of a guy who made one recently out of a ukulele and an old bugle.
He shows some detailed shots halfway through
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