On Saturday morning I woke to a fairly large puddle in the downstairs bathroom. Such a drag. Fortunately, I didn't have any solid plans for the day so I was able to tackle the problem quickly. Here is the culprit - the connection point from the galvanized pipe to the copper.
Why they chose to use a 6" galv extension instead of extending the copper, or using longer flex lines to the sink is beyond me. Perhaps they liked the rusty water flavor it provided when not used for several days?
I have little experience with plumbing, so I gathered as much info on my situation on paper and headed for, not Home Depot, but a local plumbing store,
George Morlan. They immediately had a much better solution than I had in mind and I was out, back home, hacking off the valve and galv pipe right at the copper line.
All I needed to do was install the valve right at the copper line, using compression fittings so I didn't need to solder. Then I ran the flexible pipe from the valve to the sink and that was it.
After Inspector Scully approved my work, the hideous sink-cabinet was back in place and I was done!