At the risk of sounding like I'm supporting ssetta's previous statements, as I mentioned in my own thoughts, I too am just a little disheartened to see the construction doors go - no, you're right, they're not even really that important to the set compared to Hooper's or 123, and construction sites really don't use doors like that as fences anymore (and Big Bird's nest area hasn't been a construction site since the ATC era anyway) - still, they were a nice touch and were always a familiar sight among the street as Big Bird's nest area (particularly of the 80s) was one of my favorite spots on the street. The idea of putting Big Bird's nest in a giant tree is a cute one, and I can see it working. No, the doors aren't that important, but I would miss them.