Goods shed
The wall that would not sit flat
The goods shed began as a cereal-box mock-up, which looked perfectly square until I added the roof. One wall leaned just enough to make the eaves look worried. I remade it in thicker card, checked the corners against a small square, and left the glue to set under a book. The replacement is less charming on its own and much more convincing beside the track. I kept the first wall as a reminder to test the whole shape before adding the brick paper.