Here's another file from the archives. As you can see, from the introduction page, its a comparison between the differences of putting a turret on a tank, and having a casemate mounted weapon.
There's an interesting entry there, the SU-249, which I think is the ISU-122? Any Russian tank experts want to confirm or deny?
Also for something a bit longer, here's the link to the Bombard live stream I did last week: