I decided to go the plywood (3/8") and rigid foamboard (1/2") route for my tabletop. My question is; since I will have a two level design (elevated so the main passes over itself in a 'J' shape figure eight pattern), should I adhere the foamboard to the plywood first, then cut for the elevated portion, or cut one or the other first, then cut the other before gluing? This is cookie cutter design. My concern is; if together, the mess of sawing through both the foamboard & the plywood then supporting with the levels afterwards from the grid work underneath. I'm using the Lynn Westcott method. The room/layout is 9'x19', the layout is N scale and it is a double track main with a hump yard. I hope all of that made sense.
