The pictures are pretty cool. It looks like the cabin of the kharkov II is significantly less insulated than the crew space? The hatch between the two looks as thick as the "external" doors (actual door and transmission hatch). I was also surprised to hear the windows are only double-paned in kharkov, and it doesn't look like model II is any better.

Understandable but a bit sad to see how decayed they got, especially if they're still in somewhat active use.