OK So finally after 3 months of watching the trains go around on the floor,sign1 I got my bench done ! So, I bought 2 sheets of 1/2 inch pink foam because I had no way to get a 2 inch think piece in to the back of my SUV. The 1/2 inch is somewaht flexible and I figured I could glue them together. However after reading this forum a bit, a couple of questions come to mind. Any help is greatly appreciated ! 1) Do I really need this foam if I am going to do cork roadbed or this other stuff I have seen which looks like black rubber. 2) What do I glue the foam to the plywood with if I go that route ? 3) Should I glue both pieces of the 1/2 in together or just use 1 sheet ? And what do I glue them together with ?