First we had to choose the foam board.
I found some at the home improvement stores that just seemed to thin. Well the Mean Man had a source for some free 2″ foam board (that had been used for shipping) so he grabbed up a couple of big pieces. I told him I think I needed at least 17 tall and, to be safe, about 50″ wide (I hadn’t really done any serious measuring at that point and I was knee-deep in winging it). He got a couple of nice big pieces so we were in business!