Here's bare minimum comfortable functionality I built for upstairs bathroom, using conventional fixtures available readily for a small bathroom for my 24x30 3 bedroom 1 3/4 bath cape cod style cabin. Like I previously mentioned a dormer would have been nice and made layout simpler but chose a different somewhat challenging simplicity, nor did I want to work on steel roof flashing on a 10 pitch roof later on. If you want actual measurements can't get them for you until end of the month, notice how close 28" narrower toilet is to shower entrance probably about a foot. I chose to be able to stand up without cocking my head to one side while taking a leak rather than have a runway into shower. I suppose I wouldn't recommend for disabled or grossly overweight people. Everyone that's used that bathroom hasn't had any problems or complaints with it. Good luck and imo id seriously consider nautilus brand retractable shower doors for smaller bathroom showers especially over any curtain and rod setup, or doors, out there.