The pergola and shelter show in the area between the sign and TSBD and give an alternative identification of a caboose, imo.
Here is a quick animation from J.C. Foster’s location on the TUP over the south curb of Main at the west banister. I used an eye-height of 72 inches. The timing begins about when Tina Towner begins her film at the turn and ends near Z313. Even without spectator’s blocking the view Foster’s view of the motorcade wasn’t great.
Thats good.
I think that JFK's head might have been too low for White to see at Z313.
I think that Hickey's head & the AR15 might have been high enuff for White to see at Z313. Except that some of the say 10 gawkers at the eastern barricade of the TUP would have blocked White's view.
Anyhow, if White could see the AR15 then he would have heard the AR15 fire an auto burst of at least 3 shots.
The trees on the knoll would have blocked White's view of his left side of Elm St.
U should have written White not Foster.
The arrow shows i think the high pillar of the western barricade -- the top of that pillar might have been say one head higher than the top of White's head.