Done. So far no leaks. I think, it well take about five more showers to fill the barrel. Then I will find out if the lid or connections will leak. If I remember right, the pressure in the barrel should be close around 14.7 PSI.
This is the done pix.
I put in a length of pipe so that the shower water enters at the bottom of the barrel. To help stir the water. The lid is about an 1/8", maybe 1/4 Centimeter or less thick. The only thing, holding things together is, two slip fittings and pipe glue.
just a before plumbing pix.
Spent less than a hundred on this. I know it will pay for its self. As you see it the heat is bleeding off into the basement. Not sewer.