I am familiar with the construction of a lamellophone and of a metallophone. I played anklung gamelan for several years and of course I've played around with a thumb piano.
As I understand it with a metallophone, the bars are tuned and mounted at the 1/4 and 3/4 nodes of the tuned bars.
With a lamellophone (such as a kalimba, karimba, or mbira) the tines are tuned by the length that emerges out from under the straining bar.
With the lamellophone, is the straining bar positioned at a node? Is the length of the tine that is above the straining bar important in producing the sound? How does the percussive wave interact with the tine and the straining bar?
Bonus question: Are there concussion lamellophones that are struck with a mallet? If so, what are they called?