There's still a gravel floor in the Saturn V Center. They were apparently concerned that the weight of the crawlers would be too much for a concrete floor to support, and will pour the final floor at a later time. They did, however, have concrete foundations to anchor the support posts.
The S-II's journey lasted about 50 minutes. Shortly after the S-II was mostly in place (they still had to gouge the welds to remove the I-beams before they could erect the support posts and eventually lower the S-II into its final location), we left the Saturn V Center.
I checked on the S-II's progress throughout the day; I saw some welding going on around 1:30. We attended the screening of [i][URL=http://thewonderofitallfilm.com/]The Wonder of it All[/URL][/i] as part of the Saturn/Apollo Reunion. After we got out from that (around 4:45), they'd removed one of the I-beams.
The reunion was soon underway, but by the time the fireworks were over, the S-II was still it crawlers.
It was originally planned to move the S-IVB into the building on Friday, but with the delays, that was postponed until Tuesday July 17 at the earliest (and, checking the web cam right now, it looks like rain has delayed that some more).
So, when we left the USSRC, (most of) the Saturn V was bathed in light, on its new "pad".