I’ll just get it out there: Lead-Free Solder is horrible to work with! I miss my old friend lead.
After taking numerous measurements and drawing three designs, I built number four. The first layout was done on top of the bathtub. Now I had to do is figure out where I could ingress into the ceiling in order to mount it. I had to ensure I was not hitting any of the rafters. I don’t believe 5/8″ holes add to the strength so I wanted to miss them.
Once I soldered the fittings together (out in the carport) I cleaned up and re-sanded the copper best I could. Here are before the cleanup and now mounted onto the ceiling.