I don't play stringed instruments but my daughter does and I like to try new things.
Poplar neck & sides, pine top & back, walnut fretboard, copper wire frets, aluminum saddle
Ridiculously large kerfing in retrospect.
Piezo for no reason other than I wanted to see how it would sound.
Walnut inlay on headstock.
It actually sounds decent and is louder than I would have guessed even with the ultra thin body.