Another way of tuning is related to the dulcimer and the balalaika-two strings are tuned to the same note. Play the tune on only one string. Leave the other string open, as a drone string. Box Drum First came the hollow log. Then the large slit drum, which evolved into this portable version.
Fine hardwood makes a much better sound than plywood.
Hardwoods have a very nice sound. Any size will work nicely. A coping saw is best, for the blade can be removed for cutting the inside shapes. With the saw, cut on the lines drawn. Using one or two drumsticks or a mallet, tap the different areas of the box for different tonal patterns.