My previous cardboard creations are here. My newest one is based on this schematic at What I Made. This blog is amazingly illustrated and NOT cute (in a good way!)
I made some modifications - I removed the gun turret, added more windows and some hinges so Four Year Old could play inside it too, she also requested stairs. The secret slide exit is a triumphant - held in place with a paper fastener.
I love it! Four Year Old seems to like it too - especially the flat roof and slide. But its not a fort... "its a farmhouse Mummy!"