I have two modules to build for my layout, 5 ft x 30 inches, I am concidering using blue/pink foam. I will make a rectangular frame using 1 x 4's. I am concidering using foam set inside the frame instead of the plywood top to make them lighter so I can move them to the work bench or barn for painting. For those that have used this method before which way do you do it and are you happy with it.. do you glue your cork on top of the foam or do you put a product like homosoate on top of it all?? thanks ..Ron..