Yeh I noticed the footholes in very late models too...the rung is below the others in my images...no matter mate. On the yellow text...it was meant to mention the square bubble...on all except the latest variant it is there. They must have replaced the rungs and deleted the bubble and added the bevel on the latest variant by the looks of it...
cheers mate
bullet1968
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes