Step 1: You Need:
shoe box without cover
4-6 rubber bands(cut)
Step 2: Drawing
Around the box, draw the shape of your guitar.
Find somewhere in the box and draw a circle.
Cut all your parts out including the circle.
Step 3: String Time!
tie a knot on 1 end of each rubber band.
Now keep tying each rubber band into the holes till they are nice and strong
Step 4: The Soundbox
Just get your shoebox and where you tied your knots, place it there and tape it very firmly without any holes.
Step 5: THE NECK.
Cut it out and tape it to your guitar.