So the plastered-over window is in room 5 on the Soviet Commission's drawing. Adjacent to and only enterable from gas chamber IV.
Viewing your presentation, I see they made many modifications to these buildings.
- the connecting structure between B41 and the brick building, built from materials that match the original
- the replacement of the brick building's enormous raised canopy with an ordinary attached roof
- B41 two windows boarded up with matching lumber
- B41 false interior wall added, creating an unaccessible dead space
- B42 two doors and a window boarded up with matching lumber
- B42 entry room made of brick and mortar dismantled
- B42 half of the shower heads removed
None of these are the kind of smoking gun that I'd like, but potentially every one of them fits with an attempt to make the place seem more homicidal.
I came across a 1944 article about Majdanek that you might like to see. In the center of these two pages is a photo of not three but five canisters "containing poison gas". Might be some other interesting info in there, like the claim that bodies and wood logs were alternately layered in the cremation ovens.
https://archive.org/details/sim_illustr ... ew=theater