I am planning to make my layout, which is currently built on top of three Ikea bookshelves, permanent by buying two wood sheets to move the layout onto, nail track down etc. As the boards will be supported by the bookshelves underneath at all points can I get away with using 9mm moisture resistant MDF as opposed to Birch ply (I’m a cheapscate) or could it still be prone to warping? The layout is in my bedroom which can get hot in the summer but it never leaves.
Thanks