This is instructions on how to build a keyboard key that is over 5 ft. long and looks super fresh!
To make this key you will need:

1.5 (or just 2) 4' x 8' sheets of cardboard

Plenty of hot glue and a hot glue gun

Sharp razor blade with extra blades

Long rulers/ straight edges

Pencil
Step 1: Plan and Sketch
First, I (but you probably don't have to) sketched out how my final key would look. I decided to scale my key up so that every 1/32 of an inch on the original key would become 1 inch of cardboard key. Since the original key is 2 1/8 inches long, the cardboard key would be 68 inches long. In my sketches below, I include the final dimensions of the cardboard key, as well as how to layout your sheet of cardboard to maximize its use. I forgot to note in my drawings that the thickness of the key will be 2 inches as shown in the last picture.
After laying out your drawings, it is time to scale them up and onto the cardboard. The easiest way I found is to divide up the cardboard into chunks as shown in the smaller drawings. For example, the key "head" is shown in the drawings as being 32" x 28", so simply draw a rectangle on the cardboard that is the same size. After you have drawn out all of the basic shapes with rectangles, then go back in to put in the details such as rounded corners or the teeth of the key. After your first key is drawn and you feel happy with it, it is time to cut.
Important: When dealing with corrugated cardboard, it is necessary to take note of the direction of the corrugation. In this case, we want the corrugation to run perpendicular to length of the key faces.