It's geniusLeafPiece wrote:So you could start by creating the double layered right triangle on the inside of the model again. Flatten it on the side of either wall (no squashing, just pushing it to one side). Fold the triangle in half (hypotenuse to inside corner). Fold the resulting tip over the top. This tip will actually be the pocket. The outer wall has a right angled tip that you can tuck into that pocket.
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