I got the zither in the mail, and it's not playable. There's a minor crack in the back that I probably could repair. But there's a major crack right across the top. So I'm trying to find YT videos but there's not really a lot out there.

From the guitar and violin videos I've seen, I think I'll need to remove all the hardware and unglue the back to get underneath the cracks.

But I don't yet know what to do about a huge crack.

The fretted part is weird. The frets are really high and awkward.

Really high, like a centimeter.

it looks similar to a koto if that will help in your google-ing