But for question 9 you should address the second "C" on the ground as well.

Right, thanks for the reminder. It's now on the "to do" list.

Basically I think it's there, but it's not necessarily a "C". It's just a curved feature. If you assume everything in that photo that looks like a letter or numeral really is that letter or numeral, you can find like half a dozen letters in the dirt there.

The notion that it's a "C" to mark the centerline of the stage is absolute crap. I've been in theater since I was wearing befooted pajamas, and I've never seen that done that way. Plus, there's no need to mark the centerline of a film set because there is no centerline.