That seemed like a very permanent installation for someone who is just tinkering with the machine. Running all of the cables under false floor is a huge hassle and makes fixing problems harder.

Don't underestimate the amount of work a true tinkerer is willing to perform to get the system running 'as it should have been'.

But looking at the pictures of part 3 I have to conclude that the electrical installation was certainly not done professionally. In fact: the mains wiring wouldn't even pass inspection by German law.

So tinkerer or not, I doubt this was the place where this multi-million machine (in Deutsche Marks, that is) would have been installed originally.