Turret interior, with most of the left-hand details added:
I also put the commander’s intercom box on the right, but nothing else yet. There will be more on this side as it will be easily visible through the open hatch, but the left side is pretty much finished because the gun and turret roof obscure almost everything else there.
On the real tank, the periscopes had all been removed, including their rotating mountings, so I had to open up a hole in the turret roof. Here is the kit part:
I cut it out with a jigsaw:
And then cleaned up the hole with half-round files and a sharp knife:
I also added the recoil guard to the gun:
The right (closed) side fit very nicely, the left (tubular) one was badly warped, but a little work with a hair dryer soon got it mostly into shape. I could then glue it onto the gun and right side, then bend and glue it completely in place.
The breech block and its operating handle are not on the gun. Both would be entirely out of sight, so there’s no point in adding them, if you ask me. In addition, the block itself makes no sense. It’s provided as what seems to be the complete block, but without the rounded cutout it should have on one side, and there is no opening in the side of the breech for it to slide through.
Here are some views of the turret as I have it now, with gun and basket in place, and also the commander’s hatch ring dry-fitted:
As you can see in the first shot, the whole area in front of the commander’s hatch is very visible, so I still need to build most of the gun controls. Luckily, I have good views of that in the M4/M4A1 technical manual and its shape is not overly complex, but I need to work out how big it is before I can start building it.