Bicycle brake handle for tension adjustment, brake cable for string, puller for string to go over, could also be found on old bicycle or recycle from old photo copier or ?, and strongback body made from wood or re-enforced wood and metal. The one in the picture is using a four pole "P" bass style pickup turned sideways, but the choice of pickup is wide open and there are several instructables on building one.
The striker could be a hardwood dowel or a pipe of various materials, or a pushrod from a car motor.
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A commonly asked question, but it doesn't look that hard.
Some kind of stick
Some king of steel string
Some kind of lever-based tensioning system
The trickiest part is probably the pickup
You can see everything in that one but the pick-up (or can you?)
is it kinda like one of these?