savmagoett said:

If I get you well you're postulating that the two joints on this picture are moving nearer and further to one another as the ATAT walks, right?

Unfortunately, as I understand the working of an ATAT, it's not the case…
I think these two joints only rotate on themselves and stays exactly at the place they are in this picture, plus you never see those joints doing the movement you suggest in wider shots. So the forward joint should always be visible in the prop shots with Luke, just like Angel's mockup…

Nope. What I was mainly trying to get across was the subtle 'back-and-forth' movement that the actual camera shot has during that particular 5 seconds of footage....which would allow for a very subtle 'sliver' of another 'leg-joint' coming into the left-side of the frame a couple of times to match that subtle camera movement.

It's just a possible subtle addition that would take advantage of this slight camera movement, which would perhaps help to improve the discrepancies of the full-sized 'prop' a little. Even If this was done to match the slight camera movement as I described, the gap between the added 'sliver' and the existing 'leg-joint' would still be further apart than it is on the miniatures.

So the distance between the 'leg-joints' would still stay at an equal distance from each other in the shot, as you point out. That's what I was trying to get across, and the timing of the camera movement seems to allow for it.