Step 1: Hands
We used a padsaw to cut the polystyrene at first which worked really well to get the basic shape but wasn't the neatest. When we did the second pair of hands we used a junior hacksaw blade with small teeth that worked much better.
Step 2: Body
We cut two large boxes up to create the bodies, then taped the 4 sides together before covering them with a couple of layers of papier mache. We used PVA and water at first but wallpaper paste seemed to work better. We then covered them in a coat of white emulsion.