I figure every good WC requires a good water supply.Being the GWN this would have to be inside during the winter months.So I decided to build the tank above the back door with the plumbing going to the WC across and down the back wall.(It also helps me to fill in the space.)The water would be pumped up to the tank and then gravity fed on request.I will run a chain down to a convenient spot at the side of the facility.The water supply would probably be at the back of the tank.That is about all I know or want to know about plumbing.
While I am at it this may be a good time to put in the false tubing required for the electrical system.
I left it in natural wood as I thought that this modern convenience may have been added later.