Hi_Ho,
The company that I got the keys kit from is
www.musicmakerskits.com They have everything that any musical instrument maker could dream of ... One day I am making me a dolicmer or lap harp from one of their kits. Maybe in about a kazillion years after I retire

.
Music Makers has full kits, everything needed, to create finished instruments, hardware pieces you can get separately and even children's kits to make cardboard banjos.
The Kalimba is one of the many names ... Mbira, abuboyo, ambira, bamboli, biti, chiasanchi, diti, ikembi, jimba, marimbula, pokido, and zimba are all names for the linguaphone.
Ash,
The basswood neck has a cut and shaped tongue that goes inside the opening of the gourd. It was fitted to the inside profile so that I had plenty of glueing area to secure the two pieces. When I do the next one I will include a second tongue on the top side of this area. Then I can use a screw with a plug that would join the two pieces of neck wood with the gourd sandwiched between them. Perhaps a pretty scroll cut brass plate to cover the final joint.
There is a second overlap area on the face where the gourd, birch plywood facing and neck join. So the plywood slides into the rabbit joints on the neck and the plywood had a rabbit for the edge of the gourd. Sorry! Pictures would have been easier but I didn't think to take any while I was working ...
That's for the nice words everyone!
Susan