Well that looks god damn luxurious. I have no doubt it can be done, it's probably just not cheap so not a great solution to the housing crisis. And, like your example, depends on location and such to make it financially viable to retrofit.

Just as an observation, if you look at the different floor plans, most of the bathrooms and some of the kitchens are located at the immediate entrance to the unit (more towards the center of the building).

I assume that's to minimize the cost of running plumbing from the center out to the edge. But that's a guess, it would depend on the original layout. But it does look like a consistent feature.