I am altering the design for the treehouse. First, I will switch from gable roof to shed roof. I am also chopping the end wall down from 8 ft to 6 ft. Why am I doing this (especially as I already built two walls? Well, the short answer is that shed walls are cheaper, faster and easier to build and I think the ceiling should be shorter to give the treehouse a more kid-like dimension (although it is high enough for me to stand in without whacking my head). Also, my wife wants to speed up the construction and the kids want to get in there before the snows fly!