homemade zither

Here is my latest zither, I have a few before mostly they are easy to make, they are basically a box with a bunch of strings.
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The sound hole is triangular only because its easier to cut that a round one.
The strings are acoustic guitar stings, the bottom string is a "e" tuned to a "c" , the next 3 are d's tuned to a c,d,e. the next are "g" tuned to f,g,a.the "b" is a "b" and the top c is a top "e" string.The sound is not bad I want to use a much harder wood for the bridge to transfer the sound better.There is nothing special about tuning it to a major C other than if I tuned it lower some of the strings would be too low and floppy and if I tuned it much higher some of the strings would have too much tension on them and might even break.