Ragnar,
An interesting thread to say the least.
Thanks for using the thumb-nail feature.
Your second to last pic, looks like it could be aluminium conduit.
Aluminium has a habit of "rippling" when bent over 90 degrees and it really distorts when bent.
I was talking to an Electrician from the UK that used AL conduit after WW2, but he never mentioned that saw cuts in it were needed.
In your last pic, what exactly is holding that socket to the wall?, it looks like the thing is bedded into some sort of rendering?
Most of this stuff looks really dodgy, I hope the house was worth the purchase.
What does it look like from the outside?
