electric harp guitar... like the string-end holders and the inset wooden control plate
The ruan is a round-bodied lute native to China. It is one of a family of round bodied lutes, often erroneously called moon guitars, found in both Chinese classical and folk music. The ruan is at least two thousand years old, and there are many 7th Century depictions of the ruan in court orchestras painted on the walls of caves in DunHuang.
Earnest Instrument's Stretch... It's really a small fretless bass. I wonder if it can be strung as a uke?
DSDV 3 electric upright bass by Piotr Sell, via Behance