This is a toy piano I made several years ago, and still working nicely.
Toy pianos were usually made for child, and used metal tines instead of wires to create the sound. Most of them, even the modern ones, aren't accurately tuned and sound pretty bad due to the lack of a real resonant chamber. I did an attempt creating a good toy piano, and for a first try, it went quite well.
I have made two toy pianos so far. I can build one for you if interested, just send me an email telling me the note range you'd like and the price you want to spend for the instrument.