Inspired by yours ceiling, I decide that such as wood put on the floor and on the wall where the bed. I can suggest a solution with a shower and toilet in the series. As for the furniture all you can do to handicraft. In addition to sanitation, which you can buy at the link below the picture. A shower, best, brick up, with doors that lead directly into the room, as you asked, wraps the entire ceramic tiles. i just buy a shower -handset.Have fun building it.