Make the top of your slit drum. Using the piece of bamboo or hardwood, mark the lines of where you want to cut the slits. Make an H shape on the top. For this drum, leave about 4 1/8 inches on the left side and 3 1/4 inches on the right side. Leave about 1 3/4 inches on the top and bottom and 1/4 inch between the tongues. Use the ruler to measure for the slits and draw the H shape with a pencil.
Draw two circles where the lines of the H intersect. Drill a hole in each circle.
Use a jigsaw to cut the lines you drew. Use sandpaper to finish the edges.
Make the box for your drum. Attach the two long wood planks to the 23-inch by 5-inch plank, which will be the bottom of the drum. Glue the planks or use a hammer and nails. Allow the glue to dry before moving on to the next step. Attach the sides of the drum to the bottom plank.
Attach the top of the drum to the base. Do not use the nails for the top - only use glue. Allow the glue to dry, and then try out the drum.