Scott, several forum members recommend picking up a copy of Linn Westcott's "book" on building model rr benchwork. I got mine used recently through the bay. I have a plywood top and more underlying bed over that. I am constantly cutting holes in the base layer in order to access or add wiring for switches, signals and track. I wish I would have had his book before I got too far along with my layout. Westcott suggests the cookie cutter combines the best features of the flat top and open grid approaches, although on large layouts all three can be used. I found my elevation changes were much smoother when I used a jig saw to slice the plywood forming the rising track support. Because of the way plywood bends (or does not bend) the initial slope will be more gradual than the final targeted slope solving approach problems on longer locomotives. Good luck on the build.
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