I'd be happy with an outside shower, also the places we go have facilities but my wife demands a shower. I'm screwed. Was down there today installing the A/C and I think I have the shower / RR figured out.
Here are some pics from today.

Just about couldn't bring myself to hack a hole in the roof.... I pulled some of the molding off is why you can see a green wire hanging.

The unit was fully seated in this pic, it is now.

The blue lines represent walls, the line in front of the toilet is where a platform will need to be for the toilet. The blue line under the toilet is the frame of the trailer, the reason for the platform. I have to raise the toilet in order for the sewer line to clear the frame. Think about using a shower pan liner for the "shower pan", I know red neck. And I'm kicking the idea around of using vinyl floor covering to cover the walls of the bathroom. I have seen shower curtain bars that are curved and will keep the toilet area dry since it will be up on a platform. These are just ideas, not sure if I will go this route but I can see it in my mind and I believe it will work.
