Hey there Centigrade! Assuming you mean the grounbreakers? We make them using foam skulls (cut with a foam wire cutter to adjust the jaw) irrigation tubing / duct tape for the ribs, and sometimes various pieces of plastic skeletons for arms etc. We then use outdoor carpet adhesive/paper towel mache to 'skin' them. Followed by paint or wood stain and then poly to seal them for the elements.Wow... very good stuff!
How did you make the zombie creatures? Or are those out of the box props?