Cuz dudes don't want dollhouses. 
We made this one from some of the gazillions of cardboard boxes left over from the kitchen remodel. He told me where to put the windows and doors and even made sure that his little sister had her own room and door. Whatta guy!
Tonight after sister goes to bed we are going to do the second coat of paint and add some dudely details. I'll post the finished product next week!