I remember building card houses when I was a girl. I thought they were more house shaped. All I could come up for this was more like a tower, albeit a very short, squat tower.
Great memories! We spent many winter days building card houses, but we built square rooms, added a flat roof, then built the next story! Can't remember how high we got :)
I remember building card houses too - when the kids at school are doing it I often join in hahahaha