(having a problem getting a photo loaded - will try tomorrow)
The cutouts are visible in the tramps/cops photo posted by Robert on 9/8, if that's the one you're referring to.
This is offthread, but I've always thought the timing of the Charles Bronson film of the ambulance, which shows the so-called Oswald window minutes before the motorcade arrived, could be timed by the shadow of the Records Building on the Dal-Tex.
Wonderful work, James.
Sim