- Remove the key caps from the IBM keyboard, and strip off all but the bare base of each one using a drill press and a plumber's torch.
- Cut out holes for the key bases in a piece of black felt, and lay it on the keyboard bed to cover it.
- Shape the brass carriage pieces with a band saw, and cut out interior holes with a drill and a saw. Smooth and lacquer the brass, and attach the carriage to the keyboard.
- Buy '50s-era Royal and Smith Corona typewriter keys on eBay ($65 total). Cut off the plastic on each key top so it lies flush on a key base, and glue them together.