There's loads doing this layout, correct Westphalia probably make the best but Hillside do one too. Separate single beds down stairs and a toilet for the middle of the night. (old people layout ). I reckon I've got about 5 years left before I start the midnight relief walk.
This is why it’s great that the transporter can be whatever you want it to be. I found the traditional side layout hopeless and my layout is ideal. The only reason I will probably change is to get more height and space inside at the back to store bike/inflatable kayak etc.Not sure I could sleep in that after spending nearly 60K for a reverse tardis, what a hopeless layout.