Hotel buses of course have a bathroom but no shower. Each bunk is about three feet wide and three feet high; you enter it through a zippered curtain. And the cabin is patented, so no, you can't steal the idea.
The company is called Rotel Tours (the word is a portmanteau of "rolling" and "hotel") and it has been hosting bus-bed tours of Europe, Asia, and Africa since 1959. It was founded in 1945 by a man named George Hötel. His firm's buses cater almost exclusively to German tourists; in the past fifty years, they have done everything from crossing the Sahara desert to traversing Mongolia and Vietnam.
Photo Credit: Rotel, Adam E. Moreira/Wikipedia, Orbisnonsuficit/Flickr