Birch veneer plywood is nice, but for a train platform, I think there are plenty of options that you can get at your local big box. Seems like overkill to go all the way to Reading to get plywood. Just scanning through the selection at HD, I see 12mm sanded plywood, 18mm sanded plywood, ¾” maple veneer, ¾” MDF and ¾” oak veneer that I wouldn’t hesitate to use. I’ve built cabinets with oak veneer from HD. It’s not the best in the world, but if you screw it down to the benchwork, it should be fine.
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