I cut tees into the water supply for a mens' bathroom. The lines ran overhead. I was able to shut down the entire building, sweat in my tees, sweat in valves and turn the water back on. Before I removed the valve handles, I bumped the hot and sent a little water trickling down the new plumbing wall. When you are my size, it's hard to work thru the ceiling grids without hitting stuff. I used Armaflex insulation over the pipes in the ceiling, and thru the holes in the metal studs. I am not insulating in the plumbing wall because the batt is going right back in. I used copper plated minis to hold the pipes in place. I made a backer for the drop ear ell out of the channel/track the carpenters put down as a plate for the metal studs. I bid this for 4 days. One day for my 8 hour safety orientation, 2 days of rough, and 1 trim. I will actually trim it when I install the base and panels. The Moen valve has the integral stops, so I don't have to get into the ceiling anymore.