It seems like a pointless and space wasting gimmick without much of a benefit. By being positioned upright, this design seems to require more engineering to prevent tipping over, and in constructing the stairs, which I think generally consumes more space than a horizontal space of the same size that could easily be designed without any equivalent hallway.
Also, more injuries occur on stairs than any other place in a multistory dwelling and is far more hazardous and difficult to navigate for young children, the handicapped and the elderly.

At first I thought this idea bears merit and all went well until the price 25000 euros!that is a quarter million bucks in my money R250,000.00 - but for 10k in my money (that's 1000euros) you can buy an old container. Also the wood required to build a SOLID slab of wood the size of a container is far less than a quarter million you could then use said wood and build a few homes and buy a car. Also we south africans don't do wooden houses if its not made from brick or stone then its a shack. In cape town the wind blows hard enough to flip a double decker bus over so this idea can go fool some other people.

Looks interesting but with being so tall it would be in danger of being blown over on some of the windier and stormier days here in Texas...

Like the concept for here in Oregon, My Mum would move in in a second

The stability issue can be addressed by simply interlocking the units into a large 'block' of several units (not sure if these are designed to lock together or not at the moment).
My suggestion would be to create a 'plus sign' of 5 interlocked units in a square formation - this would be 4 normal units, then a 5th 'utility' hub to go in the centre. The utility hub would be similar to the living space unit, except it would contain 4 kitchenettes downstairs, and 4 en-suite's upstairs - all plumbed/wired to connect as a single unit. You could also run a generator from the 'hub' for electricity, heating & light.

I think my kitchen is bigger than that house.

The problem with the horizontal units is that they offer no view. this just might be a unit that could be used in a tight spot to view the sea,hills or other cool locations.

This could be a great quality life improvement in the slums or favelas in Brazil or in others countries..I hope that's gonna be possible one day...with a minor steel thickness and a big production quantity it'll be possible.

Fine for an emergency,, but permanent living I'd say too small. For me at least.

I love tiny houses but have found out 7.5' sq isn't very useful for any but very short term living. Over a week and it'll get to you.
I agree with yrag on his/her points. Stairs just take up too much space.