i used two old plan drawers. framed them in the back ( now the right side). notched and installed dividers for 250 cars per panel. piano hinged the two together and wall mounted. dowels across the front of the divided sections in the front so the cars won't come out when opened to get at back layer. added a wire and turnbuckle (Z like a barn door) to the rear of the front panel so weight won't take it out of square. has a latch to keep it closed when not in use. my son quickly loaded it and only has a few unfilled spaces.
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