Here's an ad for the Kawai version of the Electric Grand Piano. This is the EP-308S Plexiglass model with a string synthesizer on top.
I think it looks major cool! Probably very, very rare.
Ian

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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.