External but attached shower/toilet cubicle(s)

I think i commented on a previous thread, that i had seen something along the lines of a connected external shower/toilet cubicle(s)....... I have since been googling madly trying to find a commercial version but having trouble. I throw myself at the mercy of the forum, to try and help me. That is if any of you know where i may find one. Otherwise i may have to go thru process of designing anf building my own. Please help me if you have found out where i may find one?...