As you can see its actually built out of a galvanised steel water tank.
A really good idea if you are an owner builder who wants to live on site.
With fully waterproof walls it’s just a case of installing the fittings and painting the concrete floor with an epoxy seal . . . and away you go.
You could say it is very fashionable if you like the ‘industrial’ look.
Basically it’s got a shower area at one end and the toilet at the other end, with the wash basin in the middle.