no roof, no walls, no rails. random rope to help climb the tree to get on the platform... I guess it wasn't so much a house as a place to play up high.
I knew some guys with 2 tree houses in different trees, way way to high, connected via ropes. The guys were almost done with highschool, and didn't use them. If we'd been about the same size/age, would have been a blast. As it was, i got to climb up and across a dozen times or so.
How many of them became engineers?
Of course, in the real world the ugliness would be so overwhelming that such a beast would never be built. Too bad the same does not hold true for software :)
I agree they are indeed too young at the moment to appreciate the tree house, but when they are older they will most certainly appreciate the fact that it is HUGE and their parents build it; furthermore, it will be a totally cool place to hang out in.
As a kid the most valuable addition to my tree house after the initial plank was a pulley so that I could get more boards up there myself.
Developing a piece at a time is much more fun.