WOW! You've done such a great job! I would not say that it's made out of a cardbox. Great, just great. I think I'm a little older than you but I also grew up in the 90th. So I remember the time with that high tech tv's, lol :) We also played with left over materials or simply with what we could find at home. We also built shelters from blankets and brought all our supplies there to survive the night (in the living room of course). We made so much mess, lol.

Thank you for sharing your tutorial and I hope that Knox will find the beauty of the house soon :)