RP Collier's Hand-Made Thumb Pianos
Bryan Day writes:
Here's an old friend of mine from Oregon - builds Kalimbas from just about anything, they are absolutely beautiful.I cannot disagree! (And there are many more in his Flickr gallery.)
kalimba mbira sansa likembe thumb-piano lamellaphone [Flickr.com]

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I agree that these are lovely, but I wonder how they sound. I'd suspect that some of the nice boxes/bases don't work all that well as resonators.
I have a mbira made from a coconut shell rather than the traditional gourd resonator; the sound produced by the coconut is much sweeter and clearer than from any gourd-based I've heard.
I agree about the coconut shell mbiras, they sound great. A lot of these are piezo'd electric kalimbas, so the sound isn't too dependent on the resonators. Quite a variety of sounds in fact. Hav e you heard the electric likembés on Konono no. 1?