Start with the foil technique on your torso.
Cut out the sleeves, and leg parts. It should resemble something close to a onesie bathing suit.
Mark where all the lines are on the torso, and cut out.
Transcribe the pieces onto construction paper.
Transcribe onto EVA foam and glue together.
Marry the front and back pieces of the torso using rare earth metal magnets.
Attach rare earth metal magnets to the front of the torso. This will be used to easily attach and detach the chest piece.
Tape the black parts of the torso and paint it all yellow.