How do you build a Nickelodeon piano (or similar midi player)?

Question by Andy Andrews: How do you build a Nickelodeon piano (or similar midi player)?
I've become fascinated with Nickelodeon pianos....I'm looking to build something similar...doesn't necessarily have to be a piano. Any ideas on where to begin? I'm having a hard time searching for anything relevant. I've checked out the Roberts Musical Restoration website which has some cool stuff, but pricey. Just want something that has a drum or two, piano (not necessarily a full one), xylophone,

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