Mathurine, The First Cardboard Sofa Bed
A summer project, by the sea.
Even though this sofa bed is not really designed for lounging but more for decoration, the structure is still quite strong enough to support your pets.
This project has been modified multiple times over a 3 month period to come up with a final cardboard piece that was noble and comfortable too.
More info on Mathurine cardboard sofa bed
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In case you wanted to make your own, you can also visit this webpage from Instructables.