Here are some images of the concrete actually being applied to the glacis plate. It is already on the superstructure front with tracks embedded. I have seen it on the roof, built around the front and side of the drivers compartment, around the cupola and extended out from the right side of the gun.
From the same book I mentioned this roof shot in a thread further down the page
craig (8wheels-good)
http://8wheels-good.blogspot.co.uk/