Interesting idea, the author build a rubber mallet with glue sticks and a metal rod. My 2 cents, I would use wood for the handle, and I think I could just melt plastic jugs down for the rubber bit. Still nice idea for about $2 in glue sticks.
http://www.instructables.com/id/Make-Your-Own-Hot-Glue-Mallet-Rubber-Hammer-DIY-Wo/