A long way down the page in the link it shows the motor compartment, where there are two upstands to take screws. The picture doesn't give any clues as to where in the hull they are, but at a guess, under the battery compartment which, again is probably under the hatch between funnels 2 and 3. Looking at the different shades of white, I feel that the superstructure should come out without the deck.
Of course, there could be plenty of screws hiding under deck fittings like bollards and cranes and there might well be a join hiding under the "pinstripe", but looking at the forecastle, that bit of deck appears to be held down by moulded tabs.