I have a table, foam for elevation, 1/8 plywood on the foam, what is next???should i glue the foam and plywood to the table? elmers?? should i put primer coat of paint on the table before setting layout??? help!!! I have a 2" elevation on a 2% grade, everything looks ready i just want to do the proper sequence of events... I plan on a tressel bridge in the middle of the high side and a small bridge on same side far end of picture.