Ragnar,
Brilliant job, man.
I like the pics.
Strangely enough, it seems funny how these fittings look very similar to some you would find in a museum over here or anywhere else in the world.
Design trends seemed to catch on back then, these days it's called "Intellectual Property".

That U/G-O/H box is rather interesting, if my eyesight is correct, it shows the phase sequence, Blue, Yellow, Red, not a colour sequence I would automatically associate with Hungary.
The box has expulsion fuses (which is normal with MV gear) and even a free hot-stick to turn the supply off, should you need to, if your tape melts.