I stay queenstown old estate. Before upgrading, our toilet is also squating type and the bottom does protrude out to the ceiling of the house below. Need to patch the thingy, last time the one on top us leak water, smelly and got yellow water dripping. Worst, the neighbour on top DIY the bowl themself, water leak and collected in the space of the cement. One day the ceiling just burst and my mum happen to be inside the toilet. Luckily did not hit by the ****water there dunno for how many years... nightmare.