Hi, Iīm in a kind of trouble! Bought the īCITY BOARD ROADS AND BUILDING BASES - 285ROAD100ī, Without thinking! And now Iīm in need something in the exact measure 20"x20"! Where and what to get? Mdf, ply, plastic, steel? Lasercut? Not ably to do it myself (kind of bad at cutting straight, and donīt have the equipment...). Donīt want anything that easy warp! And it donīt have to be supercheap...