sadly, due to construction and safety laws, it's officially uninhabitable. it can only serve a purpose of being an artistic instalation where one can stay temporarily, but it won't be qualified as a house.
Corridor width regulations and such are probably more tolerant in places with limited land area like HK, but while I'm not an expert, I'm not so sure a metal box on sticks would qualify as real estate in most parts of the bureaucratic modern world.
the first concepts were a bit different looking http://warszawa.gazeta.pl/warszawa/51,34885,12670651.html?i=...