1Get software working
Write/test either your own sketch or the provided sketch on your board to check that the sensors, outputs, and actual code is working.
You should plan out the general structure of the small robot, leaving a space in the back to put the Arduino, and enough room for all the different wired connections, especially the servo.
Cut and glue/tape the cardboard together to make your own Iron Man. Note that if you rip off one side of the cardboard, leaving a flat side connected to the wavy part, the cardboard can bend smoothly.
4Put the Arduino in
Glue/tape down the Arduino in the space you left, connecting all the different sensors and outputs to where they should be in order to make sure it works. Plug it in to test. Edit your design as necessary.
Paint and add whatever finishing touches you think the Iron Man needs. You're done!