Hi guys !
I finished the power transformer.

The brickwork look fantastic!
But I have some doubts about the roof. I have never seen concrete that has a yellow component. If the yellow was more green, I would interpret is as mould, something I have seen on several old horisontal concrete surfaces. A more reddish-brown could suggest rust seeping out from the rebar, something that is also not unusual on early concrete structures.
But this might of course be a case where there are local variations, and I just have not seen the right prototype reference photos.
When we see models without prototype references, we sort of make an mental protoype based on what we formerly have seen in real life, other prototype pictures and even other models.
This can of course mislead us totally. So I am not claiming that the yellow is not correct, but it does not feel entirely right to me.