I got the idea to build this case from this picture -> Click Thanks worderror. =)
The idea was to fit a regular components into case. Biggest problem was to fit a proper GPU without a ricer, so the case had to be tall enough.
It took about a month to find a good case by searching around shops and the net.
Eventually I found a suitable case from a local radio- and TV-service store, price 0.
Old Procaster's 7.1-amplifier whose interior had been stripped. Just what I needed for my project.