Even the handicap bath only takes up 6 feet by 7.8 feet. The others average about 6.8 feet by 5.7 feet. My favorite is the Omega, topping out at 3.6 feet by 7.6 feet. Very tidy, and does not feel small inside. To clean them, you just need to hose them down inside. It all goes down the drain.
It is a French company. If you want one of these for your house, the shipping cost might be discouraging. But if you want 10 of them, I bet you would save many thousands of dollars by designing them into your project. PencilJazz plans to use them in future projects. Perhaps someone here in the USA also supply them. I will look into that. Here is the web address of the manufacturer. Bravo Altor!