If you are thinking of making some of your own hand tools like blacksmiths did many years ago, starting with a hand saw is a great idea. It combines elements of wood working with cutting steel and fastening the two together to create a working hand saw. Though it may seem complicated at first, the process is quite straightforward and you only need a few tools for fabrication.
Drill three holes equal distance on the notched brass plate. Place the drilled, notched brass plate over the top of the steel plate. Mark the holes through the notched brass plate onto the steel plate, using a marker.
Drill holes through the steel plate on the marked spots. This will create a place to secure a "backbone" on the hand saw.
Spread epoxy glue on the steel plate with a brush along the edge with the drilled holes. Slide the notched brass plate onto the top of the steel plate and attach clamps to set the notched brass backbone. Let the epoxy dry according to the manufacturer's directions.
Put bolts through the notched brass and steel plate. Tighten them firmly with a wrench, then drill two to three additional holes through one end of the steel plate for the handle.
Cut out a handle from a block of wood using a jigsaw. The handle can be as plain or decorative as you like. You may use another prefabricated hand saw to get an idea or to copy its pattern. Drill holes through the handle, corresponding with the holes drilled in the one end of the steel plate.
Set your homemade hand saw on a prefabricated hand saw and trace the tooth pattern with a marker. This will create a template for cutting teeth. Using a dremel tool, cut along the steel plate, following the template to make the teeth. Sharpen the teeth with a metal file then bolt the handle to the saw.