As the title says, i'm unable to see where the pilot ends and where the blackjack starts. Spoiler I don't know the azrail seems to be made with a strong logic behind the design, even has room for the feet of the pilot. In defence of the BJ sculptor with my 3D experience I must say it seems a concept difficult to pull off in 3D.
Pilots arms are on the side of the blackjack arm closest to the chest. He is wearing the armor like a shield.
What about the shoulders being so far behind the head? or being extremely tall considering the concept of the first layer of armor?
I think the concept build up pictures are wrong. I think Wombat85 is right, the pilots arms are folded up inside the chest holding joysticks or similar.
I'll have Dr. Valhen preform the necessary amputations. A chop here, a chop there; and soon we'll have a soldier unlike anything the world has ever seen....