The first photo is from December 4, 1966. Upon taking possession of the Tele from Beck, Page put the original white colored pickguard back on. The Tele looks worn.
The next photo is from February 2, 1967. Page put eight reflective circle on the front of the Tele. Pink Floyd's Syd Barrett was seen in the recording session for the movie "Let's All Make Love" in January 1967 with a Telecaster with reflective circles on the front. I've always said that Page did this as a nod to Barrett, however, I have never found a link between the two, such as a live date where both bands played or a Pink Floyd date around the London area when Page was NOT on tour.
The third photo is from April 13, 1967. This is the last dated photo I have of the Telecaster with the circles on it.
The fourth photo is from July 22, 1967. This is the first dated photo I have of the Telecaster having been stripped down and had the Dragon painted on it.
So, the transformation happened between April and July 1967.
Photo five is an older, yet undated photo of the interior of the Hunt Armory. See the history on the structure at http://pittsburghpa.gov/district8/armory-history. Better photos of the space at http://rs.locationshub.com/location_detail.aspx?id=045-10000637&user=45&photopage=1 It is *plausible* in photo 5 (with the American flag) might show the same ceiling layout/infrastructure. On that last link, there is a picture of a classroom, with low, false ceiling tiles. I doubt The Yardbirds played in there.