by Billy Mc » Tue Mar 03, 2015 5:07 pm
It's just a piece of galvanized sheet metal and magnets. It shouldn't be too hard to find stuff to make up your own. My first building board was a 1" thick piece of styrofoam from a craft store and some of my wife's sewing pins. It actually works pretty well and I still use it if I need extra room.
Billy