Tiles are not that heavy or dense.
Here's a last few; couple more of the same and a couple from the other side of the nose...
Philip Sloss
Looking at her front, anyone would think she had come to the end of her life!
In that last picture, where the "NASA" logo (of the time) is, is that all covered waiting to be tiled? Its far too smooth to be tiles.
No tiles were to be put there, it was covered with FRSI
I've got a question: I wonder if the workers at Palmdale were as fascinated with the shuttles as we, the public, were when they (Palmdale) were working on them or doing maintenance??? Or was it just "another day at work" for them?