Very wise decision 452Card. I am a Journeyman carpenter who has been building custom cabinets for 44 years. There are so many variables in each application that it is best to err on the side of caution. The size of the layout, the humidity and above all the materials used in the structure that the plywood will be fastened to are all factors that affect the movement. The most stable sheeting will be apple ply and then Baltic birch but MDO with the overlay on two sides is very good also. O gauge is a very forgiving scale and as so we can get away with inferior materials that smaller scales would not accept. One suggestion though is to use the same materials for the superstructure that you use for the decking, that way expansion and contraction is consistent throughout the layout if the humidity is not stable. Some of us look at our benchwork as cabinetry and some just want to run trains. No right or wrong, just whatever makes you happy.
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